Sexual identity is simply a descriptor of the type of adults you generally go for. It is a quick way to explain to another person what you are into. It’s not really necessary to explicitly label, but it can be helpful.
It’s not prescriptive, it’s descriptive.
It’s taking a step back and looking at your self critically, like an art piece. Who am I? How might others see me? How might I communicate myself to others? Am I living authentically to me? OP is noticing new details that is making them reconsider their own ego. That’s all normal human connection and philosophy. Thinking isn’t childish, lol.
Okay, well it’s still fascist to advocate for anything other than a democracy.