Okay, so ever since I had my first period it's come too often. I have NEVER been able to come up with an answer to this, in all my searching of the internet. Basically, unlike normal people who get their period once every 30 days or so, I more often then not get it ranging from 16-20 days. Once, there was only 10 days between. I'm 19 now and I had my first period at 15. I once asked my auntie and grandma about it (my mom does not share my dilemma) and they had it too. My grandma once said that if it continues too long I'd become barren which I don't really mind, but I just want to know - what is this? (My relatives didn't know.) Is it normal? If there's anyone else out there sharing this stupid problem I'd love to hear from you. It seems pretty obscure. Thanks!