yes, such a good point, even recognizing there is a choice of conforming or not is beyond some people's awareness (especially I think in more collective cultures, whereas individualism lends itself to people prioritizing their desires over social expectations).

I do think a lot of gender norms and roles are arbitrary (like blue for boys and pink for girls, or women only in the home and men only at work), but I suspect humans do have what we might categorize as hard-wired gendered behavior as well (though with considerable overlap, the idea of strict differences without overlap is just not evidenced).

Otherwise I'm not sure gender dysphoria makes much sense, since it seems to be a natural phenomenon rooted in the biology and found throughout human history and across cultures, and is even found to be genetic. That said, gender dysphoria is still worked out in a social and psychological context and is not pure biology either, so a lot of what you are saying here is relevant about how arbitrary social norms can be.