Who Are You..?

A simple question from a simple childrens movie.. “who are you” asked the caterpillar… “Why, I am Alice!” the small girl says.. but all I can hear is the caterpillar saying “Who Are You?”. and i have no idea who i am.. well duh im only 16.. but who am i? Where am i going? whats gonna happen to me? I know parts of who i am.. my best friend in the whole world has helped me realize who i want and who i  should be.. but she also has made me realize the type of person i really am. She relates to my problems, she is suffering with anxiety and depression as well.. a few years ago i was where she is now.. the deepest part of the hole you fall into.. the really narrow dark place where there is nothing. nothing. total nothingness. but since then i have grown and gotten better.. so now i can help her through everything she is struggling with… but now im slipping back into that hole.. Its terrifying because i know where the hole leads.. i know what its like down there, both from being there before and from watching my best friend be there now.. its not a pleasant place and i really dont want to go back.. but still all i can hear is the caterpillar say “Who Are You?” and i having no idea is only making it worse..