Sexual Health

Hello Girls. Just wanna ask a question. I'm turning 15 in 2 months, and my mom said she's going to set up an appointment with her gynecologist. She told me to be completely honest and straight about what's going on and if I'm sexually active. I was okay, until she said, "But I don't have to worry about that because I taught my daughter better than that." That's when my heart sunk because I've done a lot she doesn't know about. I already feel guilty and hoe-ish. I've gotten head, and I've received manuel sex,(fingering). Is that considered sexually active? Should I tell the doctor that I'm sexually active? I definitely don't want to have that conversation with my mom in the room. I want to wait until I'm married, but the way I'm going and the things I've done, I don't think I'll be able to. What should I do? I have so much weight and pressure to bear, with all the girls in my family being super smart and Christian. And I'm the youngest. I don't want to be the youngest and the weakest. What should I do?