Don’t let other people tell you who to be or how to act. Don’t do what someone else is doing just because you think it’s “cool” or “popular.” Don’t join in on what everyone else is doing because you think they might accept you if you do. Chances are, if you are having to prove yourself for people, there is another group that will take you just how you are.
Nobody wants a clone, so don’t be one. Copying someone’s actions, speech, and outside appearance will get you nowhere. If you aren’t yourself, people will be more upset with you than they would be if you were yourself. You shouldn’t have to be someone else to be noticed.