How to be yourself? I am So CONFUSED!!!?

Hi I am a 14 year old girl and I am having some problems figuring out who I am. I am an imaginative and unique writer, and I read alot and alot of the time I kind of try to be like the characters, and when try to be myself I don't know what I like or what I should do. Do I want to answer questions in cl or am I being Hermione? Do I want to push myself to be in an advanced science cl or am I being Bella? Do I want to be kind to others and unselfish, or am I being Harry??? I am so confused and I am really shy and have no self confidence. I am a different person in each cl at school, before school, after school, with each parent, by myself, with my best friend, with guys, with other girls at school, with my animals...I am SO confused!!!!!!!!! If I try to make a decision, I never know if it is me or one of the people I have read or written about making the decision. I just want to be myself and find who I really am. Please help!!! Thanks so much!!!!!!!!!