I think I poisoned my entire school
Why do you think you poisoned your school?
I thought it up in my head.
You probably shouldn't have those thoughts. It might be helpful to talk to someone if you're fantasizing about being violent toward others.
I'm a bad guy. I don't care if I do wrong, I only care if I can get away with it.
It's not okay to want to harm others. And it's not something you would get away with. You should really focus on improving your antisocial behavior before someone gets hurt.