Can I have kids?

I been having my period every two weeks. When I told my friend she commented saying if my periods are so close up together I might not be fertilizing. That can make it hard for me to have kids. And since my periods come often, that does mean my body is getting ready of my eggs quickly. I haven’t seen a doctor for this. But am I over thinking this, I don’t want a kid at this moment but I will in a few years when I finish college.

EDIT***** I understand how women have millions of eggs, I’m just worried about my ovulation and fertilization. Also my periods are different every time. One week I could have a light period that last for three days. While other times I can get it heavy, with horrible symptoms. My periods used to come monthly but all of a sudden dropped down to at least 1 1/2 weeks.