Not wanting to be touched is not a flaw or a problem that you need to fix about yourself. You do not need to change, or get used to it, or endure it. Anyone who tells you that you do is saying so because they believe that their desire to touch you is more important than your comfort and body autonomy.
If someone refuses to acknowledge or respect your wishes for them to not touch your body, they are proving that they do not respect you, and that they may not take no for an answer in other situations either.
If a person doesn’t respect your desire to not be touched they are violating your boundaries and consent and that’s definitely enough reason to feel threatened by them. Your body will respond to that threat accordingly, with symptoms of anxiety and stress. A person doesn’t need to have physically harmed you in order to trample all over your consent, needs, and sense of safety.
Trauma isn’t always from one event. Sometimes it’s cumulative.
There is no reason someone should be touching you if you don’t want them to. It’s okay to not want to be touched. It’s completely within your right to request that someone not touch you.
This goes for family members as well. Your parents do not have an inherent right to touch your body. You are not being unreasonable by asking or telling them to stop touching you.
It is fine to want to be touched sometimes and not others. It is fine to be okay with touch from some people and not others. It is fine to never want to be touched.
It is OKAY to not want to be touched.