you have something called amenorrhea (no menstral periods or stop periods).
young women periods can stop for a number of reasons like being under weight or exercising too much, eating disorders, and more.
i can email you a website that tells you everything you need to know about amenorrhea.

Another thing i will add. My mom has Polycistic Ovarian is it possible that i too could have that, or could that be causing my lack of menstruation?