Need someone else's opinion on my current family issues

I need some advice So, I'm pan. But I haven't exactly come out yet. My mom's side of the family are Christians, my grandfather being a priest. They are mostly homophobic, my mom included. My brother, despite being only 12, has a big opinion on LGBT. He told me, and I quote, "being gay is gross". He doesn't know I'm pan, no one does but my sister. If my brother finds out, he's definitely gonna tell everyone. I'm not sure exactly what I'm asking, but I'm desperate for some outside opinions Thank you♥️🍓