Honest opinion needed, am I a slut?

I'm 18, and until recently I never went near guys. I like them but nothing ever really happened. (Throughout all of middle and high school I kissed one boy- see what I mean?) But since moving to college I started to get a lot more attention because I got way less nervous around them. However, all I ever did was kiss and even then in the space of four months I think I was with about three guys. But one night me and a very close friend got VERY drunk and ended up doing bit more than kissing. With him I went a lot further than I ever thought I'd go, but because he was a friend I didn't care. But since then we decided that scoring and friendships are really not a good idea so we ended it but we're still good friends. Since then though I've started to get with guys way more and bring them back to my college apartment (that however has only happened twice). This never struck me as anything unusual, I was honestly enjoying myself and thought there was nothing wrong with what I was doing. But recently I was talking to one of my home friends (who in fairness, knew me back in my frigid days) and she said; 'wow you've turned into a slut'. That comment really stung and I hate over thinking things so much but should I change my behaviour? Am I being too promiscuous? Also, I'm still a virgin, haven't gone that far yet but basically everything up to it.