Sexual thoughts compulsive behaviour.

I was watching porn for 6 years and masterbuting. Last year i decided i want them to stop.(not masterbution) Bcj i wanna have all with my girlfriend i don't wanna see others...bt when i tried to stop them they overpowered upon me. For sometime i could control but later.. with trigger or without trigger i became out of control..my blood flow in body suddenly increases. I think of many such sexual activities with random girls.  dn i search in Instagram with random hastags or profiles to see nude girls or sometimes text to some girls (.didn't enjoy them i try them to stop as hell).and then after all this superstrong feeling i masterbute with 0 feelings and pleasure ..end up with guilt and regret..i went to doctors took Medicine nd psychotherapy was completely cured bt as Medicine ended things came back again..now i can't go to doctor as i can't tell my parents about these and due to covid situation i can't go there easily.now what to do. how to stop please help. me nd my gf are in stress