Oh, this one, I remember reading this years and years back and being super confused on how someone never felt gender dysphoria their entire life and then suddenly felt it after like, some time in an isekai. And looking at it now, it might not even be real so it feels more and more strange to me because I can't comprehend how someone would be comfortable for so long and then suddenly uncomfortable.
Well whatever, I don't have gender dysphoria so maybe this is normal for people that do.
It varies between people, but think of it as someone that grew up in poverty, or in a bad relationship, both are metaphors that work
They are "ok", they can live with it, it's their normal state, they have been living all their life in that way so they are used to it
But then they have money, and they can eat any food they want, they can wear any clothes they want, they can buy all the stuff they want, they dealed with being poor, they were used to it, they had a normal life like that, but now they know what being rich is like, and going back to that life now would be insufferable, because you now know how much better it could be
Or they find out that relationships are supposed to be both ways, they find out that other couples actually enjoy being together, and they start to notice the way their partner mistreats them, and suddenly things that were fine, are not, because now you know they aren't normal
Yes, in both cases they were fine, they could deal with it, you could live a whole life like that without a problem, you might not even SEE them as problems, but the second you experience a better life? Dealing with the previous one just becomes even worse