I'm thinking of applying to work at a prison
Why do you want to work in prison?
I feel watching people suffer. It eases the pain of my own problems.
Wanting prisoners to suffer just so that you can watch and feel better about yourself is cruel. Instead of working at a prison, find a job where you can be happy for other people.
I just want to beat people up.
This is a sick way of thinking in my opinion. You should never enjoy people suffering.