Worried and frightened! Will I be able to?

Okay ladies I've been struggling with this for a while. I am 18. And, with all controversy aside, I am a very respectable adult with a healthy relationship and a full time job. Don't get me wrong I am young. But eager, anxious, worried, and concerned. 
I have been diagnosed with PCOS (Polycystic Ovarian Syndrome). And I can go 6 months to a year never having my period. My estrogen level is natural low because of this. I am afraid that when the time may come. I won't be able to conceive. I've gone years without any form of birth control. And have never gotten pregnant. Not to be irresponsible necessarily, but this only makes me worry more. I have met other woman with the same conditioned and that tried for years with no luck. Anyone who had the same issues?