I felt the same for a time but I realized that it doesn't matter what the porn is as long as your brain can get a high from it. In your case it wore you down until your brain just didn't care, this happened to me. I got so used to straight and lesbian porn my brain wanted to get a new high so I went with femboy Hentai and at first it did nothing but then when I kept watching my brain stopped caring and it found its high. In short porn can wear you down to some weird and extreme pleasures
Probably, it's porn mate. Many people has this thoughts, even I(regarding looking at males) Yet only girls provoke a reaction on me. Porn has taken it's toll in your life, the only may to break it is by breaking the adiction. Hang on tight brother!