Being a teenager is rough, but that doesn't mean you have to continue to suffer as you have been. Now is good time to get help and get your thinking straightened out. You're not a disappointment. People would not be better without you. They would miss you. They may be surprised to find out you feel the way you do. People can be so good at covering up depression. Can you talk to your parents about how you feel? Do you have any friends you're close enough to to talk with? If not, how about a school guidance counselor or pastor (if you're religious). I felt the same way as a teen as you do now. I just wish I hadn't tried to handle everything on my own. That just made things so much more difficult for me. I urge you to reach out and get help. You don't have to handle this alone.

You deserve everything good that comes your way and that you work for. Everyone has positive worth.