I got my first period right around my 14th birthday and have only had about one period a year since then. The most I've ever had is two periods in one year :/ I've expressed concern to doctors in the past(around age 16) and they didn't seem interested in listening and told me I would become regular pretty quickly. I've had some thyroid tests come up irregular though they weren't very far from normal. I've never taken BC & I've never had sex. I know PCOS can be a common cause but I don't have any of the symptoms besides amenorrhea. In the past I have seen the lack of periods as a good thing though now that I'm 20 years old I'm more concerned about health