The first step is stop looking at porn.
Stop thinking about porn.
What happens next is you will starting making up excuses why its ok to keep gooning.
You will feel like a failure, like its not getting better, but you have to keep trying, and eventually you'll run out of excuses and learn how to avoid falling into these traps.
It will take a long time, maybe years depending how how addicted you are.
Also read the Bible and go to church.

What's your favorite Anno(-like)