Hi im 17 years old and i have been having unprotected sex for 2 years and never once got pregnant? dies that mean i can't?

Don't bet on that: Unless you never ovulate you will most certainly get pregnant if you continue. I hope you are well prepared for that huge life change at such a young age.

Hard to say: It takes two fertile players to conceive.It would be reasonable for you both to consult with a fertility center to gain more information on the subject. Your OB may start some basic workup but your partner also needs to be evaluated.