-I'm 19 years old
-I'm 5'3", and I weigh 200 lbs.

I first had my period when I was 16. And since then I've only had it about 5 times. But now is the longest it's been since I've had it. Last time was January, 2009. I have not been on any pregnancy protection, and i have not been sexually active at all. Is there something up with this? Should I be worried? I want kids someday and I'm starting to freak out a little. >.<

Sorry about my ramblings. Just looking for a little help.