I need help!! AM I A ?!?

So it's been like 3 weeks now, and I keep getting facebook messages saying I'm a , slut, skank, dirty tramp. I've slept with only 4 guys, all older than me so that's ok. I just don't understand my friends tell me it's alright to do that at 14. But I don't like receiving all those messages. I need some advice, honest opinions is it true, am I ?