I think I hate my step-father and his family.
Why do you hate your step-father and his family?
Because they haven't let me see my real father since I was very young.
I'm sure that you're upset that you haven't seen your father since you were very young, but you can't blame your step-father for that. They are now your family and you should treat them like that. There are likely many reasons that you haven't seen your father and you can't necessarily blame your step-father for that.
They don't want me to see him. It's all there fault.
I don't think it's healthy to put all the blame on one person. I suggest you do some investigating on the matter and find out the real truth.