Women - Confessions

I've had a problem with different types of pornography all my life. Last year, I gave my life to Jesus, and promised myself I would stop all of my "go-to" sins. It hasn't happened. I still give in to the temptation, and it's eating me alive. I feel horrible every time I get done watching the porn and masturbating. I always ask for forgiveness, but in the back of my mind I wonder when God will stop giving it to me. It also makes me wonder if I really am saved. Satan keeps putting horrible thoughts in my head like, "If I really am saved, I wouldn't be doing this." Please pray that I break this. It's horrible.