It is precisely this issue which probably made you more vulnerable to addiction in the first place. One of the leading causes of addiction is a feeling of an inner void. This can be brought about by low self-esteem, child hood trauma, or people who suffer from anxiety or depression. Anyone of these can cause a person, often from a young age already, to seek "self-soothing" behaviors to "medicate" the dark feeling in their subconscious. A person may not even be aware of this, but that is what made him susceptible to the addiction in the first place, more than other people. And that is why therapy is a very important aspect in breaking free. A person needs to work through their deep subconscious issues with a professional. It is hard - if not impossible, to probe one's own subconscious.
See our
therapy page, and find someone in your area trained to deal with sexual addiction and low-self esteem. Also, Rabbi Twerski wrote almost 50 books on the issue of self-esteem. Look into buying some of them.
G-d luck!