Homosexuality has always been around. It took the development of cities to allow people to self-identify as "gay", find each other and form a sub-culture. And as a culture forms, so do cultural norms, identity politics and other things that box people into categories. What if you don't fit into the categories that gay people have created? What does that make you then? Does that mean you are making a "choice" or is it that you are forced to make a choice because there still isn't a place for you?
Or it could be your hormones. I don't know. After 50 years, I kinda don't care what my own sexuality is anymore. It is whatever it wants to be at the time.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.