You're younger than fifteen? That'd be the first half of your second decade (birth to ten I'd call the first decade). I suspect you meant you are in your early twenties, which seems "about right" for early onset MPB, if any age is "about right." Time to embrace it, the razor, and the knowledge that any problems with hairstyles and haircuts are over for good. Of course, life will always present a lot of other problems along the way...
Welcome.