Trying to quit sissy porn

Hi everyone, I'm 15 and I'm going through a period of great confusion and change. I started watching porn when I was young, but over time I slipped into more and more extreme content, until I got to the so-called "sissy porn". It wasn't something I really wanted, but over time it seemed like the only thing that could turn me on. The problem is that it doesn't represent me, it makes me feel confused, guilty and distant from myself. I'm in a relationship with a girl I really love and I want to take back my sexuality. I don't want my mind to be dominated by a type of pornography that makes me feel weak and dependent. I've blocked all the sites and I'm trying to detox, even if I feel like it's going to be hard. I've read a lot of people talk about OCD, and I wonder if this is part of it. Has anyone been there? Is it really possible to get turned on by normal, natural things like a real relationship? How long does it take to get over it completely? Thanks to anyone who answers. I know it may sound ridiculous or extreme, but this is a serious battle for me. I want to be my own boss again.