I am not addict to porn, but my mind is fucked

In fact I never used porn for M or O, I always fap with fantasy on my mind. Thinking to pretty/hot girl was enought to make me horny and i usually invent somes scenarios to enjoy it. So I started fapping to the girls we see on ad, music clip etc... (specially Kpop during the last 2 years) and each time i think up a hot background scenario. One time i watched porn to see what it is, it make me horny but i find it too dirty to fap (It was just a girl sucking a cock...) the fact is, in my mind my porn is very smooth and i never fapped to naked girl, beacuase cloth make the girl prettiest or powerfull.
One time i had an opportinuty with a girl but i wasnt able to be horny, (still Virgin)
I am at day 9 of 90 days of PMO challenge and each time i listen music (kpop) i start to think to the girl, evry night i have sexual idea in mind, and i dont know how to erase this to enter in hard mode 90 days challenge where there is no sexual entertainment.