Guys don't like "good girls"...?

Why? I don't understand. Why are guys more attracted to girls who party hard, drink, have sex with whoever VS girls who don't ever drink and are virgins? I rarely ever drink alcohol (I'm 17) rarely party and still a virgin and it's really embarrassing for me to admit. Guys I like usually tease me for it and all. I don't understand :/ why can't they just accept it?