Sel-punishment. I need help.

Since 2 month, I started hurting myself to see bruises evolving on my skin. I cut little strings on my feet and beat my left arm with a hammer, so I could see those blue marks. But recently, I realised I tend to hurt my self whenever I do something wrong. Like I believed I lost my bus cards, I return my place upside-down to realise it was in my bag from the beginning. I felt like a big big idiot and hurt my hand. And today I lost a case in town. It had very important papers for school in. I'm really angry against me. I, again, hurt my self. It feels a little better afterward but... I think I need to talk about it. But I can't do it with my friends or family. So I though it would be easier with someone on mangago.

Have you been deeling with self-punishment ?