Teens - Confessions

A year and three months ago I become addicted to internet porn. No one would suspect that someone as conservative as I would ever fall prey to this. But I did, nearly as soon as I came across it. I hated myself for it, so I tried to get accountable by enlisting the help of my youth leader, close girlfriend, and boyfriend with the free version of XWatch (I really liked the enhanced feautures of X3Watch, but didn't want my parents to find out about my struggles here). Problem is, after almost a year of using it, I still have the desire to go back to porn. Every once in awhile I'll type in some dirty keywords to see what comes up, though I never visit the sites. It doesn't seem to matter what I do, the desire is still there. When I get to see my boyfriend (he lives several hours away) the desire for it completely leaves. I try to keep in prayer, read my Bible, be open with close friends about my struggles. But I feel like I'm losing this battle, and it's losing the war too. How can God use someone as filthy, evil and prideful like me?