It will take time. I completely get the addiction to that type of porn - I was there. The ONLY way to get rid of it ... and you are the ONLY person who can do this for yourself, is commit to avoiding it completely for a long period of time. You'll still remember it, but the memories will be less and less vivid over time, and that's what you need. Remember every time you go back to it you re-enforce those images in your brain, so every time you are tempted, you have to get quite stern with the little demon, this little mind parasite that has taken up residence in your brain. It is the only way out.
As I've told another person, you have to go all Gandalf on it. And maybe you end up tumbling to the depths of your psyche struggling with it - that may be necessary as long as you are committed to fighting it to win. How badly do you want out? That's what it boils down to. Tell it, "YOU SHALL NOT PASS!!!!!"
*Avoid all porn, or you'll just end up substituting another type. Even then, probably not, though -- since you're "there" you'll likely seek out the same stuff again. You do not want to end up with PIED, like I and many others here have. From the sound of it, you are well down that path. It will interfere badly with real relationships with real women.