"Why does your sexuality matter?" Dilemma

Anna

My family are frustrating me a lot. Long story short, my friends have all known I'm bi since I was 15 but it wasn't until I was much older that I convinced my parents I was serious coming out to them. Now even though they and my sister know, my extended family don't and I keep getting told "you don't have to tell them, you're not dating so it doesn't matter."

Easy for them to say when they're straight.

I guess my question is, should I keep the peace and say nothing, or come out to everyone and risk upsetting some of them? I'm torn between the part of me that just wants to be a good daughter and the part that feels like I'm living a lie.