Relax. You will become an adult. You will figure out your career. You will find someone who loves you. You have a whole lifetime; time takes time. The only way to fail at life is to abstain.
Weight loss does not make people happy. Or peaceful. Being thin does not address the emptiness that has no shape or weight or name. Even a wildly successful diet is a colossal failure because inside the new body is the same sinking heart.