There are support groups and recovery programs for people who have sex and/or online addictions. Yes, that includes cyber-sex, internet porn, etc.
Here are a few links...
Sex Addicts AnonymousSexHelp.ComA CyberSex FAQA whole bunch of links and resourcesCenter For Internet Addictionand a nice article.
You could look and see what resources you've got in your area. The same goes if you've got any other addictions floating around - or potential addictions. Working to be rid of some issues can cause others to pop out around the side if we aren't watching for them.
Do you see a therapist, counselor, psychologist (etc.)?
Have you considered counseling?
Addictions of any kind aren't just a matter of weak self-control. Over time, a physical aspect develops as certain parts of the brain get stimulated over and over and over. It means that if we want to recover, we need to stay mindful of ourselves - otherwise, our brain would just do what it's always done when left to go on it's own.
So what are some of the thoughts that you notice going on? If we can look at what you're thinking, we might be able to help you untangle and find where it's off. Heck - sometimes just writing it down or typing it out helps me see my thoughts more clearly, and then I can see the parts that just aren't working.