What beautiful advice folks have given! I can scarcely add to it, except to say ---
-- you know, life only gets better from here, my friend... only gets better.
Psychologist Erik Erikson defined eight specific stages in life. Age 11-18 is the period for the
identity crisis.
And, strangely enough, the harder time you have of it now, the more certain you'll be of yourself later, in many ways. You'll have figured things out that other people will carry as baggage their whole life.
That doesn't mean you should drive directly into pain. It means you know you have to face a struggle. You're not alone; this is the point in your life when everyone is in that position. Believe in yourself: as painful as it might be, there's a point to it, there's an end to it, there's a transformation in which you come out the other end as a butterfly.
Other people envy you this struggle. To study yourself, to figure out what you like, who you like, who you are and how you'll get on with others... is a beautiful thing, part of what gives our lives deeper meaning.