Do you think its weird that I used to punish myself when I was a kid?
Why did you feel the need to punish yourself?
Even though the world was so unfair to me, I blamed myself and cut my wrist.  I also hated school
It's wrong, and very risky, to do things to cause harm to yourself, especially when you know that you are not to blame.  I hope that you have gotten over this desire, but if not, there are people who can help.
Whatever.
You need to find a better way to work through these issues and find a way to stop using harm to yourself to get through your issues.