You have taken a brave first step in coping with this issue. Let’s see if we can focus this effort.
I think you have accurately identified your addiction. Browsing through the personal ads is like an alcoholic gargling with whiskey. Each component of your behavior and thinking indicates this is operating like an addiction.
Just like the compulsive behaviors that come with alcoholism there is some help. Sex Addicts Anonymous is a good place to start and there are several facilities that treat this behavior. I would start by looking at the material on the SAA site and go from there.
I am impressed with your courage in wanting to deal with this directly.