At your age, Frannii, I use to do the opposite! I would pick what friends/others had not picked, whether I agreed/wanted it or not. I think some of it has to do with not having very much experience yet; I've made millions of choices in my 62 years now but you have only made 5-10 years worth? So, when confronted with a choice or a "style" of being, you are still trying different ones on to see which you prefer. It's not a bad thing, how else can you see what you like for yourself? Everything is learned and chosen and your friends you are "borrowing" from had to borrow from others to do what they're doing, just look at the history of the "thumbs up" gesture:

http://en.wikipedia.org/wiki/Thumbs_signal