I may be lying to my friends by accident?

Well, this my first time posting here on HuniWhisp. The thing I have to say is I may be lying to my friends unintentionally? I (13 NB) am in a discord server where we talk about silly stuff and Deltarune/Undertale, but I think everyone thinks that I'm female? I have told them multiple times I am non-binary, one of my friends (who ignores all pronouns, we shall call him Greg) refers to be by she/her, despite my birth gender being male. I think everyone else thinks this way because my discord avatar is a female presenting character, so it would make sense that they call me by girl pronouns. Anyway, another friend (Who I will call Sunny) usually refers to be as they/them (my correct pronouns) but they said while making my Mii in Tomodachi Life: Collection, a game where you can't make Miis non-binary said "I'll make your Mii a girl because thats your irl gender." I have no idea how to tell them or any of them and I'm worried they'll all get rid of me if I do, since they've been doing things like this for 4 months, and I never intervened. Should I just not talk about it and not lean towards any side of the gender spectrum, or should I outright tell them, and if the latter, how so?