Porn addiction. If any medicine give me.

Sir I have severe porn addiction problem and master.since 13yrs I have been doing so.for this habituality I cant get out of this now.I have made so many effort to get out of it.Not a single effort help me.i am in  situation that I have wasted my whole life on seeing this porn video.After gaining so much knowledge about porn ,still I am not able to overcome it.i can feel it's side effect.but still I am not able When feeling comes ,it is so obsessive and compulsive that I am forgetting all motivation and knowledge(bad effect of porn) and watching porn and doing masturbation. I am in such a obsession that at a time I am watching porn video 12 to 14 hr. Sir pls help me.if any medicine give me.but I need to out of it.otherwise my career and my life will be wasted.