Stop watching, and looking at porn. Throw out all things related to porn and get rid of them, burn them, throw them out, shred them, etc. Then enroll yourself in a group for people who also are trying to quit porn. (I'm sure there is many of those all over the place.) It would be better if the group was a religious group. And maybe seek therapy if you feel that your problem can't be stopped with group therapy and throwing out all the porn (and not buying more.)
Hey guys try thinking clean. Do sports or something to get your mind off of it. I'm Mormon ofcourse haha. And I pray to be less tempted. It works! Find a book of Mormon!