You've hardly begun to live at 13-15 yrs. old. Many of us have a painful time of it at your age. This time in your life will pass and you have plenty of years ahead of you to find your way. In the meantime, try to focus on the things that bring you happiness and satisfaction. Best wishes to you.
Age isn't totally unrelated. It's no coincidence that so many who post comments such as yours tend to be very young. I've never seen someone 56-60 ever say that they don't have a reason to live. The problems you've cited are serious ones, but they aren't unusual and different people are obviously impacted in different ways by them. If you have depression, it's certainly something you can't help and can occur in people who have had little trauma or tragedy in their lives. It's usually something that requires professional help, something I hope you're getting.
You have to find a goal to strive towards.
You still have your whole life ahead off you. Accept yourself focus on the positive things,
Your only what 14 or 15 for godss sake ?? how bad can things be ?? go out side & play . go to your church, this is the reall world girly not no dam make believe .go for a walk & talk to god .
just ask god to help you with stuff