When is a good age to lose your virginity?

I am a 15 year old girl and I was just wondering if that was too young to have sex ? Is it socially except-able at this age or will I be seen as a slut? Also I am definitely not waiting until I get married, I just don't see the point in that. I do have a boyfriend so it wouldn't just be meaningless sex, but still, am I too young ?