same thing happened to me with my cousin like 8 months after I started coming out. I tried to boymode but he figured it out and texted me afterwards to apologize for misgendering me and deadnaming me, asking what he should call me going forward. it was really mature and I appreciated him a ton. I didn’t come out to him because that side of my family isn’t safe (my dad, his parents, etc. are all extremely queerphobic / fash adjacent or outright fash). so I asked him not to out me to anyone other than his wife. I did get outed but idk by who.

I suggest thinking about who in that group is safe and coming out to them - it sounds like they’re all trying to be helpful/supportive and I think you’ll be pleasantly surprised. plus it’s a huge weight off your shoulders.