*hugs* Hun, self-harm isn't the answer, nor is anything else self-destructive or permanent. There are options available to you, including counselling/therapy, anti-depressants (if needs be).
I strongly suggest you find (what I call) "alternatives" to self-harm. So when you get urges to hurt yourself or feel ****ty, talk to someone, write things down, distract yourself (tv, online, games, music), do something creative, relax in a bath, whatever works for you stick with it.
Have faith in yourself, stay as positive as you can (I know that's extremely hard when you feel so low, but do try). I used to support on www.recoveryourlife.com
, have been on that site for four years and it's a very supportive and positive place.