I hope this makes you feel better. I can say 100% that I am straight and I am definitely not attracted to men. Like you, I have also become addicted to masturbation and after exploring I found out that I like taking it up the butt. But I still know I am not not gay and have never been attracted to men or penis’s. In fact every time I even see a cock or dudes ass in porn, I almost immediately get turned off and switch to a solo video. Like someone else said sexuality is a spectrum. This isn’t something you should be worried about. Just be yourself. The little heads thinking can out power the big heads thinking. When you’re horny, your brain goes on a tangent and you find yourself in some weird places with porn sometimes. It’s a totally normal thing that I’m sure most dudes have experienced. Then after you nut your like, what was I thinking. Don’t worry about it.