I have no personality of my own?

My friends have started to notice that I don't have my own personality. I just emulate different people from time to time. I currently listen to a lot of hip hop, dress in boyish clothes, have cut my hair short and am joking more... exactly like my newest best friend. For the past 2 years I have been learning Spanish, traveling to South America, growing my hair, playing soccer and became a vegetarian trying to be exactly like another friend. I can look around my house and every item or memory I can attribute to someone else's personality. Is this a problem? Will I get my own personality? Could this be a disorder of some type?