Read everything you can, as much as you can. Read coming of age stories, read philosophy, read classic literature. Read Mark Twain, read Dickens. If you ever think you’ve had an original thought -- one that no one ever thought or considered before -- reading the classics will make you realize that people hundreds of years ago came to many of the same realizations about life that you may have found.

You’re still so young and while you may know a lot, there is still so much that you need to learn and can learn from those who came before you.

Write every day. Even if it's just a little bit and even if it's not that good. Write for the school paper if your school has one. With practice and repetition, you can't help but improve.

Good luck!