Don't be so down. You're a beautiful girl, you're young, you have already experienced much more than most other people your age, and you have your whole life ahead of you. The things that sadden you today will be completely forgotten in a relatively short amount of time. Be sad when the great loves, adventures, experiences, and milestones in your life are behind you and you no longer have them to look forward to. For now, they are all ahead of you, and that's reason enough to smile.