How can I fight this addiction?

Ok, I need serious help. I feel my soul is at stake here. First off, I'd like to say, I don't wan't ANY opinions here, as this is a sensitive question. I'm not posting this to troll. If you don't agree with my beliefs, that's cool. But please, I don't feel like hearing about it. I'm a Mormon. We believe in being pure, chaste, virtuous, etc. Problem is, I'm not. I've been fighting a and masturbation addiction for 2 years now (im 18.) It's easy to go for a few days, but soon, it builds up, and I give up. I get these thoughts, and they bug me to do, over and over, till i give in. I'm in the 2 step program right now, but I need more than that. Any advise on how to control one's thoughts and actions?