The first time I did it I was 13. I thought everyone hated me. I know they did. My mum and day kept yelling at me and I was getting picked on at school.
I can't describe it but it's like I started getting a bad noise in my head. The first time I hurt myself it was cos the noise was just to loud and I couldn't deal with it no more. It made me angry and I hit my arm against the door frame. The pain stopped the noise.
Now I can't stop :'-(