Please don't come at me with "not all men" of course I know not all men are like this

I have had so many instances where a guy will say hi to me. I like talking to people and being courteous so I'll say hi back and we will chat for a bit, no intentions on my part at all. But apparently this is an invitation for men to start reaching for me(putting their hands on my waist, hips, trying to kiss me) or if I'm at the rails they'll like "trap me" between their arms while holding onto the rails. It's so creepy and weird and very annoying, and I have a tendency to freeze (I wish I was more bold like other women and easily tell them to don't touch me). Yet even the few times I have told them I told i dont like being touched or grinded on they stop for a few moments then do it again. And it's only with men I have had this problem with, never women. Any tips/tricks that you do to prevent this? I go solo raving quite often, and sober raving at thst. It's different if they ask if I want to dance or they are respectful and ask before touching, I jist hate it so much when I'm being friendly and they just start touching. I was at Photon in LA and it was mostly ruined because a guy kept trying to hold me, afyer only a few sentences of talking on the dance floor.