In my view, there are two categories of homosexuality: learned/acquired and innate. Some men have been homosexual since they were kids, like staring at their school friend and feel feelings/have a crush on. That’s a case of normal, stable homosexuality as far as I’m concerned. Now take my case, I was born straight, always had a crush on girls, always had a totally masculine identity, male engagements, and no, I’m not a Christian. I was simply born straight, but unfortunately, I had early internet access since childhood, and used to watch an overload of porn/hentai, plus early masturbation in childhood. I would spend a lot of time locked in my room using my computer, and over time, I came across pornography, got hooked, and it ended up warping my brain, starting with imagining that I was in the woman’s shoes in porn (autogynephilia), that was my first homo sexual desire. Chances are 100% that an abusive watch of porn, hentai, and early masturbation, as well as traumas of neglect and bullying, distorted me. Otherwise, I wouldn’t have had any other fetishes that went hand in hand with homosexuality, like cuckolding for example. Whenever I’m horny, and I finish cumming, I regret it right away, as if I’d been possessed while jerking off. So in my opinion homosexuality is both innate and acquired. However, I’ve been looking all over the internet and only found a few cases.
Putting aside, for the moment, all the very problematic things you declare in this post which are being ably called out by others in these comments already, bisexuality is a thing. It’s also a spectrum that can shift around, expand, contract, and otherwise change over time.
Many bisexuals thought they were exclusively heterosexual or homosexual until they found themselves developing sexual interests outside those rigid definitions at some point in their lives, whether early or late in life. It’s a thing, it happens to average people regardless of what media they may or may not have been consuming, and it’s not all that unusual as these things go.
That being said, you might find it healthier to just take stock of your feelings now rather than trying to blame them on something external as though it were some sort of condition which has been afflicted upon you. Your sexuality just is what it is as you experience it, just like your hair grows in the color it does and your height reaches the number on the ruler it does, and it really doesn’t serve you to go down obsessive rabbit holes and develop neuroses about it.