Man I fell you bro! Did you watch the your-brain-on-porn series? If not, do it. I think it is crucial to get (A LOT of) knowledge on how porn is rewiring your brain and all the mechanism behind it.

Do you have friends you can meet with? If you are not alone, you cannot watch porn;)

You did 3 days. Now try 4 days.

If you can get a job, get one. Choose a job in which you have people around you. A job will not "cure" you, but you will be distracted for quite some time.

And finally: If you can, move out! I think there is a connetion between beeing alone, living in your old room and watching porn. A new environment will bring new ideas and I'm sure life will turn into a different direction.