I was just a freshman last year, and was really nervous. I had watched Mean Girls and was afraid of a group like that. Oddly enough, girls were against downright mean-ness. All the "cool" girls DID avoid the wannabees and weirdos, but do an average girl that wasnt part of their clique, they were perfectly nice. Just be calm, casual, don't ever insult anyone even behind someones back, if someones finds out your crush, just be like, "Yeah, he's cute. I might ask him out." Remember, you left middle school behind where they did this kind of thing like, "No, I don't like him! Eeeww!" Then blush, and everyone would laugh and say you luuuuv him, and ya..lol.
Also, stay on top of homework, don't get lower that B-'s on anything, because grades matter. Don't overrreact to anything anyone sais about you or your freind or something, just be calm, relaxed, and truthful...jut not insulting. Be confident. Be sophisticated. Be clever. Be calm. Stay with the latest trends. Ok, now I'm done with da tips, lol,
wear a babydoll shirt from Weat Seal, a dark denim mini from anywhere, and some matching flats and a headband. Also, get a purse from Forever 21.