How To Tell My Mom I’m Sexually Active

I’m 16. I’ve been w my bf for a year and a half. She knows I’m on the BC pill but she doesn’t know I’m having sex. She’s asked me a few times about it but she looks so mad when she talks about it. Today she asked me if I was a Virgin and while I was hesitating to answer she was like “ kids now a days, I raised u smarter then that” so after that comment I lied and said I haven’t had sex. How am I supposed to tell her I’ve had sex when she makes me feel bad about it or gets mad!? I wanna talk to her but I don’t think I can. Should I try to tell her or just not? Help me what do I do?