Why is saying “no” so hard?

What a boundary is, and what it is not

A boundary marks where what you can carry ends. Therapist Nedra Glover Tawwab describes boundaries as the expectations and needs that help you feel safe and comfortable in your relationships⁷. They cover your time, energy, body, money, emotions and values^7,10. For autistic people there is often one more area that rarely gets mentioned: sensory needs. How much noise, how much physical contact, how much conversation you can manage in a day⁸.

A boundary is not an attempt to control the other person. “Stop talking like that” asks them to change. “If we talk in this tone, I will end the conversation” says what you will do. The difference looks small, but it is the difference between a power struggle and a boundary.

Glover Tawwab describes three kinds of boundaries⁷:

• Porous. You say “yes” to things you do not want to do, you fear rejection to the point of paralysis, you accept being treated badly. They leave you drained and overstretched.
• Rigid. Walls built for protection: you share nothing with anyone, you cut people off at the first difficulty, you say “no” harshly so you are not asked again. They often come from a history of being taken advantage of.
• Healthy. They start from what you know about your physical, mental and emotional capacity, and they are said clearly. They can change when your life changes.

Many people have porous boundaries in one place and rigid ones in another. That is not a contradiction: it is how you protected yourself wherever you felt unsafe.

Why it is harder when you are neurodivergent

Finding boundaries hard is not a character flaw. It has a few sources, and in autistic people and people with ADHD they add up.

• Internal signals arrive late. To set a boundary, you first have to notice you have reached it. Many autistic people find it hard to read their emotions and body signals, and discomfort often shows up only as tiredness, tension or shutting down. You can agree to an outing without realising you are already drained, and only find out the next day⁸. Slower processing means you sometimes notice a boundary was crossed only after the conversation is over⁸.
• Masking. Many autistic adults have hidden their reactions for years to fit in and stay safe³. Masking is not a free choice but a response to stigma². Someone who learned to seem “easygoing” puts their own needs second, sometimes to the point of burnout⁸. A common example: asking to change hotel rooms because of cleanliness, when the real reason is the noise, because the sensory need feels less “acceptable”¹⁶.
• The urge to placate. Therapist Pete Walker named “fawn” the threat response in which you try to please the other person in order to stay safe¹³. Claire Plumbly describes it as an unsafe kind of effort: you feel obliged to say “yes”, even against your values, to avoid a threat¹⁰. It is not a weakness but a strategy that once protected you.
• History. Autistic adults report experiences of bullying, exploitation and abuse more often than other adults⁵. In a study of 43 autistic adults, many described giving in to unreasonable requests out of fear or to avoid conflict, and finding it hard to recognise abusive behaviour in time⁴. When “no” has been punished many times, the nervous system learns to avoid it.
• Unwritten rules. Many boundaries are communicated through hints. If you say things directly and take them literally, it is easy to miss someone else's boundary or not know what you are “allowed” to say⁸. The misunderstanding does not belong to one person: it arises between two people who communicate differently⁶.
• With ADHD, “yes” is fast. The enthusiasm of the moment, the wish to help and the fear of disappointing someone make “yes” come out before you have checked whether you have the time. What follows is an overloaded schedule and the shame of not keeping your word.

In the study that defined autistic burnout, participants named poor boundaries and difficulty self-advocating as one of the barriers that lead to burnout¹. Many said they had not known they were allowed to say “no” to tasks or expectations. Among the advice they would give others: it is okay to turn down what you cannot handle, and to notice when your boundaries are being crossed¹.

A boundary, from start to finish

A boundary has several moments, and each asks for something different. Many people get stuck not at “how do I say it” but at the step before: finding out what they need.

1. BeforeFinding out what you need

   You do not need to know exactly which emotion you feel. It is enough to notice tension, irritation, tiredness, or the sense that something is off even though it looks fine on paper.

   What helps here: Three questions: how do I feel about this, what words fit what I feel, what do I want to say. And, if you do not know yet, the right not to answer on the spot.

2. In the momentSaying it

   Short, in the first person, without long apologies. You can speak, send a message, use a note. All of them count.

   What helps here: A phrase prepared in advance. Building a sentence from scratch under pressure takes a lot of energy; a ready-made one you only have to pick.

3. If it is pushedRepeating it

   Some people will test the boundary, especially at first, because they are losing something they had. That does not mean you got it wrong.

   What helps here: The same sentence, again, without a new justification. And a plan B decided in advance: you leave, end the conversation, ask for support.

4. AfterGetting through the guilt

   Guilt after a boundary is common, especially if you are used to pleasing others. It is not a sign that you did something wrong.

   What helps here: Concrete kindness: “I said what I needed, and it is okay for that to feel uncomfortable”. The guilt fades as the boundary becomes familiar.

Before: finding out what you need

Sharon Kaye O'Connor suggests a three-step process before a decision or a reply to an important request: you check how you feel (on a walk, while washing up, in quiet), translate the sensation into words that fit you, then express it⁹. If you do not have the answer on the spot, you do not need to. Some sentences buy you time⁹:

• “Let me think about it and get back to you tomorrow.”
• “I need a minute.”
• “Good question. I'll come back to you on that.”

With ADHD, a pause is even more useful. Shawn Horn suggests a 24-hour rule: when emotions are at their peak, you wait a full day before reacting, settle yourself in the meantime, and only then ask whether things still look the same¹⁴. A simple rule: no important “yes” in the same conversation in which you were asked.

There is also a middle option between “yes” and “no”: “not now”. O'Connor recommends it especially during burnout. You take on nothing new while your energy is low, but you leave the door open for when you recover⁹.

In the moment: how to say it

The guide co-produced by autistic adults in West Yorkshire offers four simple steps⁸:

1. Say what happened, like a camera would: “when you touch my shoulder without asking...”
2. Say how you feel, in the first person: “it startles me and I tense up.”
3. Say what you need: “please ask me first.”
4. Decide what you will do if it happens again. You do not have to say it out loud, but it helps to know for yourself: “if it happens again, I will step out of the conversation.”

A few things make a difference:

• The phrase, prepared in advance. Megan Anna Neff, a clinical psychologist who is autistic herself, recommends having your sentences written and rehearsed for the situations that keep coming up¹¹. O'Connor offers a three-step formula: pick a need, pick what would help, and write a short sentence that you adjust until it sounds like you⁹. For example: “I love spending time with you, but after an evening out I need a day without plans.”
• “No” is a complete sentence. You do not owe a long justification, and repeated apologies turn the boundary into a negotiation^8,9.
• You do not have to speak. A written message, a note, an app or a gesture all count, especially when you are overloaded or shutting down⁸.
• Say it in advance, when you can. If you know you will manage an hour at a party, say so at the start, not in the minute when you can no longer cope⁹.
• Start with someone safe. A person who listens with curiosity, even if they do not understand straight away, is the right place for your first boundaries. Around them, your nervous system settles. With people who dismiss what you say, sometimes the best boundary is distance⁹.

Kristin Neff and Christopher Germer add a nuance: you can say “no” with care for the other person, acknowledging what they want and still saying what you can do. Kindness towards them and firmness towards yourself do not cancel each other out¹².

If the boundary is pushed

First boundaries almost always meet resistance. The people around you are losing something they had, and the resistance is usually temporary¹⁰. Claire Plumbly notes that subtle resistance is more common than aggressive resistance: the request ignored so that you feel awkward repeating it, “are you sure you can't make time?”, guilt-tripping or flattery¹⁰.

A few responses for the most common patterns:

• To guilt-tripping (“after everything we've done for you”): you appreciate what they did and you still need this space.
• To upset or silence: you give them time to process, without taking the boundary back.
• To testing: you repeat the same sentence. You do not need to justify yourself again each time⁸.
• To escalation: you name the upset and suggest talking when you are both calm.

It is okay for a boundary to change if it is no longer working. The change should come from your needs, not from other people's pressure⁸.

After: guilt, and choosing not to set a boundary

For many people the hardest part comes afterwards: the feeling that you were rude, selfish or unkind. Glover Tawwab puts it simply: guilt is part of the process, and at the start it is to be expected⁷. It does not mean you did something wrong; it means you are doing something new.

Neff and Germer write about a “fierce” self-compassion, the kind that protects you, alongside the tender kind that comforts you. Their image is a mother bear defending her cub without hating anyone¹². A boundary is often exactly that: care for yourself, said firmly.

Sometimes a boundary is not possible. Turning down a friend is not the same as turning down your manager when your job is at stake. Neff and Germer say that if you choose not to set a boundary because the consequences would be too great, you can do so consciously, knowing you have the right to it and are keeping it for later¹². Do not blame yourself for the boundaries you could not set.

Boundaries with yourself

Boundaries are not only about other people. Some are rules you set for yourself: how many tasks you take on in a day, when you stop, where you no longer mask if you do not need to⁸.

• Rules decided in advance take the daily decision off the table. Autistic adults writing about burnout on Reddit describe rules such as: no meet-ups on workdays, at most two social events a weekend, fixed times for calls¹⁷.
• A “skin” for too much empathy. Some autistic people absorb the emotions of those around them as if through a porous skin. Megan Anna Neff builds herself an “artificial skin” out of routines, interests, rituals and deliberately chosen boundaries¹¹.
• The body has limits too. Niamh Garvey, a nurse who is autistic herself, describes the point where, after a day in which her children needed a lot of closeness, any further touch becomes too much. She also writes that getting used to a stimulus gradually only works when you choose it and stay in control; imposed from outside, desensitisation is not a limit stretched but a limit crossed¹⁵.
• Unmasking needs safety. Letting the mask drop is a kind of boundary with other people's expectations, but Megan Anna Neff insists it should start only where you are safe¹¹.

For people with a PDA profile, a fixed rule can itself become a demand that weighs on them. Then it helps more to phrase it as a choice: not “I must rest”, but “I can choose whether to go out for two hours or one”.

When support makes sense

A guide can give you some words and a few tools, but boundaries are best practised in a safe relationship, where you can get it wrong without consequences. Support makes particular sense if:

• you say “yes” by reflex and only find out the next day what it cost you;
• you have come close to burnout because you could not say no;
• you fear the reaction of someone close when you tell them “no”;
• you do not yet know what you need, only that something is not right.

In therapy we can find together the phrases that sound like you, rehearse them before the real situation, and talk about the guilt that comes after. I work online, on Google Meet, in English and Romanian. You can read more about therapy for autistic adults, or start with the guide on rejection sensitive dysphoria if fear of rejection is what holds you back.

Questions people ask

Is it selfish to set boundaries?

No. A boundary takes nothing away from the other person: it only tells them what you can and cannot carry, so they do not have to guess. Kristin Neff and Christopher Germer draw a useful distinction: a freely chosen “yes” gives you energy, a “yes” said only to be a good person drains you. Sometimes sacrifice is right, for instance when someone you love is ill. What is not right is the idea that your worth comes only from how useful you are to others.

Do I have to explain why I am saying no?

Not necessarily. “I can't” is a complete sentence. A short explanation sometimes helps the relationship, but you do not owe anyone a detailed justification, and long explanations usually open the door to negotiation. If you need time, you can say “let me think about it and get back to you”.

Aren't fixed rules just rigid boundaries?

It depends on how they feel to you. Many autistic people rest better with rules decided in advance, such as no more than two outings a weekend, because they no longer have to decide from scratch each time. A boundary becomes too rigid when it allows no exceptions at all, even when an exception would be good for you. For people with a PDA profile, a fixed rule can itself become a demand that weighs on them, and then it helps more to phrase it as a choice.

What if someone keeps crossing my boundaries?

First, repeat the boundary clearly, without new justifications. If nothing changes, you decide what happens next: you leave the conversation, reduce contact or ask for support. If you have come to fear the person's reaction, or feel you are not allowed to say no, it is worth talking to someone outside the relationship. Research shows that autistic adults more often end up in relationships where they are taken advantage of, and can find it harder to recognise abusive behaviour in time.

Sources

1. Raymaker, D. M., Teo, A. R., Steckler, N. A., et al. (2020). “Having all of your internal resources exhausted beyond measure and being left with no clean-up crew”: Defining autistic burnout. Autism in Adulthood, 2(2), 132–143, pp. 136, 139–140.
2. Pearson, A., & Rose, K. (2021). A conceptual analysis of autistic masking: Understanding the narrative of stigma and the illusion of choice. Autism in Adulthood, 3(1), 52–60.
3. Hull, L., Petrides, K. V., Allison, C., et al. (2017). “Putting on my best normal”: Social camouflaging in adults with autism spectrum conditions. Journal of Autism and Developmental Disorders, 47, 2519–2534.
4. Pearson, A., Rees, J., & Forster, S. (2022). “This was just how this friendship worked”: Experiences of interpersonal victimization among autistic adults. Autism in Adulthood, 4(2), 141–150.
5. Griffiths, S., Allison, C., Kenny, R., Holt, R., Smith, P., & Baron-Cohen, S. (2019). The Vulnerability Experiences Quotient (VEQ): A study of vulnerability, mental health and life satisfaction in autistic adults. Autism Research, 12(10), 1516–1528.
6. Milton, D. E. M. (2012). On the ontological status of autism: the “double empathy problem”. Disability & Society, 27(6), 883–887.
7. Glover Tawwab, N. (2021). Set Boundaries, Find Peace: A Guide to Reclaiming Yourself. TarcherPerigee, chapters 1, 4 and 6.
8. Mental Health Equity Project, The Advonet Group (2025). Autism and Boundaries: Strategies and Resources. Community guide co-produced by autistic adults in West Yorkshire, pp. 2–5, 8–13.
9. O'Connor, S. K. (2026). Healing Autistic Burnout: A Neuroaffirming Guide for Connecting with Your Authentic Self, Restoring Your Energy, and Advocating for Your Needs. New Harbinger, self-advocacy chapter (ebook, PDF p. 152–168).
10. Plumbly, C. (2025). The Trauma of Burnout: How to Manage Your Nervous System Before It Manages You. Balance (Hachette), ebook, PDF p. 78, 155–158, 231–236.
11. Neff, M. A. (2024). Self-Care for Autistic People: 100+ Ways to Recharge, De-Stress, and Unmask!. Adams Media, ebook, PDF p. 65, 72–73, 155–156.
12. Neff, K., & Germer, C. (2024). Mindful Self-Compassion for Burnout. Guilford Press, ebook, PDF p. 183–185, 195–205.
13. Walker, P. (2013). Complex PTSD: From Surviving to Thriving. Azure Coyote.
14. Horn, S. (2025). Thrive Socially with Adult ADHD: Shame-Busting Strategies to Build Better Relationships Using Polyvagal Theory & Neuroscience. New Harbinger, ebook, PDF p. 73.
15. Garvey, N. (2023). Looking After Your Autistic Self: A Personalised Self-Care Approach to Managing Your Sensory and Emotional Well-Being. Jessica Kingsley Publishers, ebook, PDF p. 147–148, 166–171.
16. Engelbrecht, N., Bercovici, D., Silvertant, E., & Jones, K. (2024). The Ultimate Guide to Autistic Burnout. Embrace Autism, pp. 36, 114–115.
17. Clarey, M. M., Abel, S., Ireland, M. J., & Brownlow, C. (2025). Autistic burnout on Reddit: A Sisyphean struggle with daily tasks. Journal of Autism and Developmental Disorders.