@Tandora
Feeling like you are not quite the same as other people of your sex was, for women especially, experienced and understood differently at very different times.
In 1425, people believed “not feeling like a woman” was evidence of religious vocation — you were probably called to be a spiritual recluse or a nun.
In 1525, you might be likely to experience it as a medical issue: an excess of humours, maybe; or a bodily distemper. If your father was learned and wanted to teach you Latin, however, it might be evidence of your natural attunement to the humanist ideals of the new scholarship.
In 1625, if you didn’t feel like a woman and you moved in wealthy and courtly Protestant circles, you might be thought of as an unusually pious woman with a scholarly vocation; if you were unlucky and poor, people believed you were probably a witch.
In 1725, if you were unlucky, people might believe you had been possessed by a demon. If you were lucky and came from a wealthy court family, you might instead become a playwright or a poet.
In 1825, if you didn’t “feel like a woman” you would likely be thought of as mad; or, if you were rich and bohemian, you had an artistic sensibility.
In 1925, people believed that feeling “not like a woman” was the cause of homosexuality.
In 2025, people believe it makes you “trans”.
All of these are ways in which people fit their own “feelings” and experiences into the beliefs that are current at the time. But, importantly, they are all still belief systems, or ideologies, or cultural trends.
How will people interpret their feelings of disconnection or difference in 2125? One thing’s for sure: it won’t look the same as the current idea of “trans”, if one goes by historical precedent.
(Note that male ideas of sex and sexuality all across these time periods tended to be always much more about sex, particularly same-sex desire, sexual activity and sexual fetishes. Not until quite recently is there much evidence of men claiming they really are women — and, tellingly, this starts to appear roughly concurrently with women starting to achieve some degree of legal and financial rights. There was not much evidence at all that men liked the idea that they might really be women during the periods when women had no vote, little control over their lives, and little financial autonomy. Funny, that.)