don't wanna be touched

So this past year I've been really aloof? I guess and I've been really against hugs and being touched, idk really why but I guess I just feel trapped? I think it stemmed from my friend who always feels the need to touch me and even if I tell her to stop she won't and just laughs because she likes annoying me because it's funny and I invited her over to my house for a sleepover and she pinned me down and straddled me and wouldn't let me up and she just doesn't stop when I plead her to and even this girl who I don't really like because she's annoying and always yelling and running around and it's distracting for me, she realized that I don't like hugs/like to be touched and doesn't do it anymore but my friend will just touch me because she thinks it's funny to annoy and irritate me. What should I do?