Being labeled as a "hippster" or "a prep" does not define who you are. The clothes on your back and the shoes on your feet do NOT define you as a person. You are only 15 years old, and I can see how you do not understand this concept right now. With time I think you grow to learn to realize that you do not need to belong to a specific group. Sure it may be a bit obsessive what you are currently doing in order to change your everyday style, but when you truly come to realize who you are, you will not need "style" to define yourself.