First of all, your sins are forgiven, Christ died for all the sins of the world past, present, and future. But this does not mean you will not come under discipline from God for your sin, so it is best to turn away from temptation and sin of all types as much as possible. Confession of sin gets you back in fellowship and filled with the Holy Spirit. This is where you should live as often as possible.
Secondly you must understand that porn is
addictive. There are a huge number of men and women all over the world that are suffering from this addiction. Porn is one of the most lucritive businesses in the world so it's not ever going to go away. I suggest you get educated about this to better understand what's going on. There is more and more research being done on this addiction, there are books available you can read. A good starting point is this very informative website:
https://www.reddit.com/r/NoFap/