How do I get myself mentally ready for having to wear a dress?

Because, in Hungary we have a tradition that when you graduate you have to go and dance, IN FUCKING WEDDING GOWNS. Now, yes its a beautiful tradition for the people who want to do it, but Im not one of those people. But I just KNOW my parents will force me to do it, or even if they "accept" my no there will be a huge fight that I know I wont be able to handle, and no Im not out to them and Im not willing to come out to them anytime soon either because theyre transphobic.

So how do I get myself mentally ready for the fact that in a year or so I'll have to spend hours in a dress, dancing with a guy I propably wont even know, who will try to hit on me and shit because OF COURSE people usually have their boyfriends or crushes as their partner and for people who cannot get one, they just assign a boy from a grade lower or from another school. I already hate the whole thing and we havent even begun planning it with my class yet and I know I will just end up hiding in a bathroom and crying by the end of it. I already dread the comments from relatives about how beautiful I am like shut your bitchass up I dont want to be beautiful I want to be handsome