Is it normal to not have a period for six years?
I'll give some basic info first.
I'm 24 years old, a virgin, asexual (non-sexual), active (kayaking and surfing), and not on any sort of birth control. My period was pretty stable in high school, that was until graduation, when I noticed the number of days I had it were becoming shorter and shorter. First it was five days, then three, then two, then none at all. I thought nothing of it, and continued on my life in college. Years past, and I was reminded of my lack of a period by my roommate, who needed some girl things, but I had none to give her. Saying I didn't have a period. After some explaining, she got really worried and said I should have gone to a doctor the first year it stopped. It's just not normal for a woman my age to not have anything at all. It could mean I could never have children either. Though that's not a loss, as I've never wanted children.
Thing is, is it THAT unusual? I've been told to go get checked, but with the bad economy and being a student (and we all know college kids are the poorest of the poor), I couldn't get checked even if I wanted to. So do any of you ladies out there have any advice? Have you heard of this kind thing before, and what did they do about it? If it means taking medication, what kind and will it be expensive or take me away from school? I can't compromise my classes and future career for medical costs. They are way too important. Thanks in advance!