How to get people to stop touching me?

I don't like it when people touch me. I hate it when people rub my back or hug me (the worst). I didn't even liked being picked up as a baby, so I guess it's just a personality trait, I wasn't traumatized ahaha. My mom says that I should go to therapy but I don't want to!

She keeps poking me and sitting next to me and I run away. She gets mad at me and looks really insulted, but I can't stand it! It makes me so nervous and scared. Every time she touches me, she says 'you need to learn to apreciate this' and 'humans need physical contact'. I'm sad because I'll never be able to feel nice when someone kisses me or hugs me, but I don't want to change, I don't need physical affection. I apreciate people by talking to them, writing to them or doing activities with them, I don't 'need' that type of love. My mom even told me that if i want to make love with someone one day I have to learn to like this. So what? Maybe I'll never have sex! Maybe I'll never be in a romantic relationship. I don't care.

I think that the next time she touches I'll tell her that this is my body and I have the right to do what I want with it. This could be considered as abuse. If it were a guy poking me and snuggling with me all the time it would be wrong, but just because she's my mother I'm not allowed to say no?

How to I let people know that I don't want them to touch me? How do I say it nicely? I usually let my kindness take over and let my friends hug me but inside I'm dying. What do I do?