What happens during your first visit to the gynecologist?

Long story short, I'm in my first relationship so my mom got me an appointment with the gynecologist. I'm shy af and whenever I go to the doctor, she is the one that talks. Do I just say, hey doc, I'm sexually active now! What kind of questions should I ask. And what really happens in the first appointment? Is she gonna look at my concha? Oh goodness, help!