College changes things for everyone, even people who have behaved badly in the past... Example, I went to a hs with a lot of rich kids and cliques and I was never in one, just had a few close friends as I was pretty quiet.
I went to community college for 2 years, than transferred to a larger university. I saw one of the snottier, pretty girls from one of the cliques in one of my larger classes, but never paid much attention to her. One day she tentatively came up to me and said, "Hi TB...um, I'm ______, do you remember me? We went to the same hs." I was thinking, you have to be kidding me. I smiled at her and said "Hi ____ , of course I remember you [never speaking to me ONCE]. Hope you are doing well!" and walked out. I assume she wanted class notes or something from me...I know she still hung around with the same group of girls from hs in college (hearts full of poison is a great phrase), so why talk to me NOW? In two years, she was the only girl from that group I ever saw.
My point is, don't let some nasty kids from your past ruin your future! My guess is you are applying to larger universities and you really might not see as many as you think (if any at all), but if you do, ignore them...and I bet they have their own issues at this point, too...sounds like they did back then as well. But by college they should have other things to focus on. Plus, you will be meeting tons of new people and making new friends.
Apply to great school and focus on your future, it's what most important...don't let some losers from the past bring you down, you deserve more!