I don't have a steady schedule with my period... good or bad thing? PLEASE HELP!?

I got my period when I was 13 and a half. I'm now 15 years old. I don't have a schedule with my period. At first I thought it was a good thing, but now I'm worried that it could be something bad! I'm averaging 130 days in between my period. I'm hoping that it's not PCOS. I don't really have a lot of the symptoms of PCOS, so I'm hoping that it is a good thing. I'm really worried that I might not be able to have children when I'm older. Am I lucky that it comes just a few months out of the year, or is my boding telling me that something is wrong? Please, please, please, please, please help me out!!! Thanks!!