Time to change

I discovered masturbation at the age of about 5, and porn aged 11. I've always had a very high libido, especially for a girl, and spent a lot of valuable time everyday 3 hours+ masturbating for a long time. Luckily I was considered by my peers to be very "hot" because of my features that media currently portrays as beautiful, really all women should be called beautiful, but this was actually a curse because it made me arrogant. However porn had made my standards impossibly high and I would hook up with guys and treat them like shit and got a sadistic pleasure from not giving them what they wanted. Teasing, but never shagging. Having discovered porn at a young age, my categories quickly got more and more extreme. *relapse warning* Tease was quickly replaced with BDSM and eventually urine, prolapse, scat etc. I started getting pleasure from damaging others. Venting anger on others. Eventually I found myself acting out on myself. It got to the point where I was taking enemas on myself and smearing on me, while masturbating (gross, I know). I got more risky and would poop into my tights and use it as dildo, and much more extreme things that I feel ashamed to share. When I had searched "is masturbation bad" I got answers like its healthy, so I only got worried when one day my younger brother walked in on me doing something terrible that I can't share (by this time I was not closing doors because I liked the risky feeling) and he was extremely shocked, scared and started crying. After lots of searching online, I came across NoFap, read through lots of peoples cases and acknowledged I have a problem. I want help I feel like I've abused myself and others and I feel very guilty. I want to stop before my selfishness takes the better of me again.