I'm angry at my parents for rejecting me because of previous actions despite me seeking help for my mental issues
Can you explain what happened?
As a kid I asked for help in being accepted for being bad in school
Your parents were growing up while you were growing up. It is hard to hold their mistakes against them. They were probably trying the best they could.
My parents deserve to be disowned and ignored.
I think it is still worth trying to have a relationship with them. Have you tried to set up a family therapy session? I think you could really learn and heal in that kid of space.