"we discuss the morality behind sex before marriage and we both bring up some good points but she makes it extremely clear that she'd NEVER do it unless she was sure she was gonna be with a guy for the rest of her life and even if that was the case she'd get married to him before she fucks him. (btw shes 17 and im 16) "
HAHAHAHAHA I've met 6 women who have said that. None of them are virgins now
People say a lot of things. And at the time when you asked her, it was the truth.
The truth about personal choice changes, it is moment to moment. You could totally f-close her. It might take some time(and i'm not suggesting it's worth the investment, although your 16 so maybe it is). But 2 or 3 months from now after she's telling you that she loves you, when you hit her with some "slippery slope" technique, it will be a done deal. Then by the time she's dating the 2nd or 3rd person long after you've broken up she'll be giving blowjobs on the first date, and having sex with them by the third.... it'll happen.