Today I played Super smash bros with my 8 year old cousin, when I picked Rosalina he refered to me with feminine pronouns during that match. It was weird because this is first time I was gendered correctly but also felt great. And he isn’t aware at all about my gender identity issues so I wasn’t expecting it at all.
Don’t hate yourself for it! It’s so difficult, and muscle memory can be a real pain! Best of luck.