Hi i have been struggling with a porn addiction for the past three years and i want to stop for good

Hi bro. You are not alone, and you can fight this.

The first thing I would suggest is to read the guide https://www.nofap.com/ and the FAQs, and also browse and read the forums. I have found lots of help in reading the success stories for positive motivation, and the problems of other fellow forum members to understand how much pain this can cause (negative motivation).

I also suggest you become an active visitor and poster. Trying to help others even with some small words of encouragement, telling about your experiences and how you feel etc. is of great for others and also for you as you reflect and rationalize your problem too, and you are yourself helped in the proccess.