Irregular Periods


I started my period for the first time in December of 2013. Since I started, I have never been able to predict my cycle. I once went from August to December without having one, I once had three in the span of a month and a half, and I am currently on my second one of the month. This one seems to be wayyyyy heavier than usual, with extra cramping as well. I am not sexually active, and my parents would flip if I asked them about trying birth control to regulate them. Any tips on getting your cycle to regulate?