If you really think it's not good for you and you want to stop then i suggest you take it seriously. First of all things you need to avoid sexual stuff and get rid of erotic things like photography. Am sure you know well about what am saying but i just want you to think about it over again. Try to keep your self busy with other things and convince your self that you are way better than that. I have a lot to say fr but if you really want to stop masturbating then you should take it seriously and act like a real man.