Control your sexual lust. You could block the websites, throw the magazines (in case you own them) or detach yourself from the websites, as long as your urge to stop your addiction is strong or, you could make a journal and make a progress. Take it slow. You could also consume your time doing other beneficial things to keep yourself busy but still, you need to ensure that you're getting better, not worse. All the best :)
Only look at it when you're masturbating. A lot of porn addicts spend all day just downloading images and movies and not actually using them for their intended purpose. That's when you know it's an addiction.