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.