Teens - Confessions

I began looking at porn when I was 14, now I'm 16. At first I figured I could stop looking whenever I wanted to. Now I realize how incredibly foolish of a mistake I made now coming up on three years (and the same one my brother who know about everything currently assumes since he's too young to be like that, boy he's gonna be in for a shock). I've been trying to quit for so long, made so many hopeless prayers, set up x3watch with two accountability partners, performed numerous ceremonies at my church saying I would be better. It's all been worth squat. My mind tells me to stay away from it but my body just zones out everything I've been taught and goes into overdrive. Those images have taken over me. I can't even look at the girls I know without lusting over them and being a perv. I hate myself for it. Even worse, now I think the girl I like likes me back; in my mind I would never do anything to disrespect her in that way but I'm scared the desires of my flesh (from Galatians 5:16, my motto for a long time now) will take hold of me if the opportunity came. please help and pray for me I'm so ashamed...