We find a group we click with and we decide it is because we are the same type of person. Then we wear the things that type is supposed to wear, and do the things they are supposed to do, even if we don't always agree with it. It is all part of trying to fit in, and being part of something. I really don't like to classify myself, but sometimes I do it without thinking. I would like to be one of those people who is friends with everybody, and doesn't prefer one group over another, and doesn't try to fit in with any certain group.
Some people are like chameleons, and change to fit their environment.
If they are with a group of skaters, they wear the wide legs and chains and try to be a skater. But when they are with a group of preps, they wear their shirts tucked into khakis and try to be a prep. It won't make them like you any more. And if they don't like you, you shouldn't change to fit their standards. You are made the way you are for a reason.