How do I move on with this?

My friends are mean and I'm generally a really nice person. I share and I care but that doeasnt seem to fit their category. I have always seemed to get past this because I need friends right now....I'm in my thrid year of high school and I need people around me to be happy. Everytime I hang out with them...something goes wrong where I feel like so different from them and out of place, they are more like the wild girls and they want to do crazy and dumb things sometimes, for example one of the girls in my group seriously wants to get slutty dresses for homecoming, and I dont approve at all but i keep my mouth shut and I'm not goin to go to a school event looking like a tramp. I am very well brought up I guess you can say (not saying they aren't) and I'm very reserved. I feel so out of place and I feel so unwanted sometimes when I hang out with them. Maybe it's my personality but maybe it's them....I don't know ? It's so hard to move on becase everyone in highschool already have clicks and it seems so hard to move on but I secretly really want to....please answer sorry it's so long