Help!

Katrina • わたし の なまえ わ カトリナ です。( ^ω^ )
Hi guys, my names Katrina and well my family and I just recently moved back to Japan (I'm not Japanese) anyways I do have a bf here in Japan, and we've been dating for a while now(not to long) but I really really like him he's very sweet and kind. But you see he's a virgin and he asked me to be his "first" and well I'm freaking out because that's huge to me!!! Like damn!! That's freaking insane! Idk how to respond to his question, I'm just asking for some advice on how and what to do rn. (May I add that I myself is not a virgin)