Men - Confessions

My name is Nathan and I am 23 years old, I've been struggling with lust now for the past 4-5 years. The first time I was exposed to pornographic images i was about 8 years old. Its so hard to get away from sexual content in this culture since you are surrounded by it everywhere you go as you all know you see it in the Movies,TV, hear it in music etc. About 5 years ago when I started really having this addiction of looking up sexual content I don't know why but for some reason I always had the thought "Well it can't be bad to look up sexual content if Im not having sex so whats so bad about it?" It was Satan putting those lies into my head to make me think it was Ok. Here I am 5 years later though still struggling, I try to go on for a month without screwing up and yet I always seem to fail every time. The problem is, I don't look up this stuff on my computer I look it all up on my iPhone using simple built in programs that come with it such as YouTube and looking up stuff I know I shouldn't be looking at, so what do you think? Should I sell my iPhone and maybe go back to my plain, simple, basic phone? If thats what it takes then maybe I need to do that. The only time I happen to look at this stuff is at night and I get this sexual urge to do it and when I do it I only do it for my own pleasure. Every time I mess up I always mark it down and then I look back at all those marks and count how many times I've screwed up and its a lot. Whenever I mess up I feel so dirty and filthy and I feel God is looking down at me and saying how many more times are you gonna do this? "I don't know if I can forgive you anymore." Yet he does still forgive us whenever we confess and to me that is amazing. But the enemy knows my weakness and that is when he attacks best. I just need to learn to be strong and resist these temptations that come my way constantly.