How should I come out?

I'm bisexual. I have tried to come out multiple times before. But no success. My mom's heterosexist. I don't even want to want to come out to my father. He'll be disgusted and will disown me. My mom will be disgusted too. But I just want to talk to someone irl. I rlly have no friends so no one to talk to other than my mom. So pls of anyone knows how to safely and convincingly come out pls suggest. I'm in a dilemma here.