Lets say I was raised on an island of men. I had no idea of the concept of women, and all of the people I’d ever seen were male.
In this world, clearly, my self perception would be different. I wouldn’t have a crystalised identity, I wouldn’t be able to tell you my gender. What I would have, is a life long discomfort that I could never identity or address. My body would have been wrong, but I couldn’t have told you why. I’d have been different to the men all around me, but I couldn’t have told you how.
It’s similar to how I processed my trans identity before I had exposure to trans people or and understanding that transition was a thing.