What if some people just don't have gender identity?

I recently saw someone on Twitter muse that, upon reflection, they don't feel that they have gender identity as a separate entity from biology and social construction.  (I don't remember who tweeted this and can't seem to find it with the search function, so if it was you do feel free to chime in.)

This was surprising to me, because, upon reflection, it's become glaringly obvious to me (a femme cisgendered woman) that I do have a female gender identity separate from biology and social construction.  (Actually, with reflection, I become less than 100% certain that biology has anything to do with it.)

Obviously, it would be just as assholic for me to suggest or even obliquely hint that this tweeter's self-knowledge is wrong and they do have gender identity as it would for them to suggest or even obliquely hint that my self-knowledge is wrong and I don't have gender identity.  (And I'm sure neither of us is suggesting such a thing.)

But that leads me to a new idea: what if some people just don't have gender identity? And by "don't have a gender identity", I don't just mean people who are agender (although this would certainly encompass agender.) I also mean that, if someone doesn't find it particularly difficult to fulfill the societal expectations corresponding with their biological sex, they might not even give any thought to it. Biological sex and societal expectations and sexual orientation provide enough to keep us occupied, and if the convergence of these factors doesn't cause you any problems, you might not even think about it. (I only thought about it because of my Eddie Izzard fandom.)

At first glance, it might seem bizarre to those of us who do have gender identity for someone not to have such a basic component of self. But there are other basic components of self that not everyone has.

For example, I myself don't have spirituality. There is nothing spiritual in my brain, I don't have spiritual needs, I don't have a soul, it is simply not a part of me.  Many people have spirituality (even some people who aren't religious), but that doesn't mean that I'm failing to perceive my own spirituality, just like my aspirituality doesn't mean that they're wrong about their own spirituality.

When I was a child, I identified with the Catholic religion in which I was raised and was able to live comfortably within the framework of Catholicism without examining it in depth or giving it much thought.  But when I did examine it in depth, as a result of my catechism class's emphasis on faith and later as a result of my parents' arbitrary change to the rules surrounding saying grace, I came to the realization that I simply did not have faith or spirituality in me.

If circumstances hadn't led me into deep self-examination of my professed faith, I never would have realized that I don't have spirituality and would have blithely continued to identify as Catholic and live life accordingly.  Similarly, perhaps there are people who don't have gender identity, but never find themselves in circumstances that lead them to deeply self-examine their gender identity, so they blithely continue to live in the gender they were designated at birth.

Also, if my life circumstances had been different and I lived in a context where having a religion was seen as more necessary to multiple everyday aspects of life, I might have found it easiest to continue the appearance of identifying as Catholic and performing Catholicism even though there was nothing inside me.  And this would be even more true if I had found the theology unobjectionable.  Similarly, people who don't have gender identity and who find the gender they were designated at birth unobjectionable may well find it easiest to simply live in that gender.

And if they've never been in circumstances where they have to self-examine their gender identity, neither they nor anyone else would even know that it isn't actually there.