Help! I'm 17!

I'm 17 n Ive been n insanely addicted to gooning n porn form 4yrs. I've tried many times to skip but the longest one was just of 40 days!. And the problem is also that I just can't control myself like if I'm not alone I just go to another room n rub my cock to the bed n fap in that way.. So please help me I'm very stressed abt what gonna happen to me if I just don't end it..

Advice means a lot..!