Are you a virgin?

So, I have the same friend group as my boyfriend of two years, very early in the relationship we both agreed to keep anything that happens between us very private, like our first kiss. But we have gone past that stage and done "more", which I will not get into because I am 15, and sometimes our friends ask us about " how far we've gone" how am I supposed to answer that? If I say " I'm not telling you" they will know.

WHAT THe FUck aM I SuppoSed To SaY?

What the fuuuuck, I'm not asking about your masterbation habits so why do you want to know about my possible sex life?