Why spend your time being sad when you could spend it being the lovely, beautiful person you are? But if you can’t control being sad, then that’s okay too! You still have the time to do wonderful things.
If you are asking yourself (and your friends), "Am I really a writer? Am I really an artist? Chances are, you are. The counterfeit innovator is wildly self-confident. The real one is scared to death." (Steven Pressfield, The Art of War)