I feel for you man. I had acne that destroyed my self esteem and sleep problems and struggled with depression as well throughout my teens. I've had to deal with a lot of shitty people in my life too. But I think you were wrong this time. It sounds like you have some anger issues you need to workout. Figure out a way to calm yourself when you start feeling angry. Just walk away next time.
Your step-dad does sound like a jerk though, try to get outta there quick! lol
I Wish you all the luck in the world, life really can rain down shit when it wants to.
Atto Suggests...:
Book - Malazan Book of the Fallen series
Game - Metro Last Light
TV - Deadwood
Music - Forest Swords