Should I come out? Need advice.

Hi everyone. I'm not sure if this is where I should post this but here we go. I'm a female, 21, and I have a boyfriend of 2 years (who I am absolutely in love with). I am bisexual, I always have been. I've been with multiple girls. My boyfriend knows this but he and a couple of my super close friends are the only ones who know. I know that my bf is the man I am going to marry. We live together and already have plans of getting engaged soon.My family has no idea I'm bisexual and I am absolutely terrified to tell them. They are not very accepting of this kind of thing. But it's eating away at me. I am very close with my family and I feel like I have been lying to them for all of these years. I don't think I will ever have a girlfriend again (if all goes as planned lol), should I come out to my family? Or should I just keep it from them?