I am not forcing myself to play out of misguided spite. I play this game (and others with solely female MCs) because I want to. I love the Regency Era, I love romance, and I love the pining that comes with being a lesbian in a period story. There's not many games with all three that I can live through vicariously, so some sacrifices must be made.
Not to say that it is a sacrifice to pretend to be a woman. You do not know my gender identity, therefore you do not know my limits, but it isn't as cut and dry as "being referred to as a woman is bad for me". I still identify with womanhood and its societal expectations. I still identify with sapphic relationships. I much prefer pretending to be a cis woman to be lesbian in a game because the feeling in the relationship is entirely different to me. Being a cis woman in a game whose only romance options are men doesn't feel... as fulfilling. And it's amazing that there's a Regency Era game where those lesbian relationships are at the head of the game (with a 2:1 ratio!!) and it's unapologetically lesbian. Not a half-hearted participatory award in representation.
TL;DR... I would pick a nonbinary option if I could, but I'm completely fine with being cis as long as I still get to romance ladies because the dynamics feel fuller than a hetero relationship. And please consider how already niche genres are even more limited for people who aren't cishet, so we usually have to make do with what's available.