Your here for a purpose. You may not have found that purpose yet but the stronger you are the sooner you'll find it. Forget lifes worries and stay strong! If you have know one to talk to go on walks get some fresh air. I know how you feel really and it's hard. Sometimes I feel like everyone is against me, that know one cares. You may think hurting yourself is like your way out. But don't do it! go buy a dog if you can cuz they really help.
Get a good book to read, if that doesn't work, start a journal, write down how you feel, and why!! Many times, just putting your feelings on paper, really helps! If you have a teacher, or counselor at school, you like, talk with them.. Always, remember, you ARE loved!!