Societal expectations

I'm 18 and have only ever slept with one guy who was my (now ex) boyfriend of 1 yr, I'm currently talking to a guy who I really like and who I really want to have sex with. However I'm worried about the views society has on women who have slept with "too many" men and I'm feeling that 2 guys at 18 is quite a lot? I don't know if I'm being too worried about what people think and should just do what I want or whether I should consider societies ideas of "sluts"... Help please!!