I went on the pill when I was 19. I had horrible cramps and the flow was aweful. Finally after hearing me complain and missing so many college classes because I was curled up in the fetal position on my bed, my mom gave in. I wasn't sexually active, but was missing at least 3 days every month because of my period.
I am 36 now and still on the pill. Tried to stop a while back and had to get back on. It makes such a difference. My 18 and 16 year old neices were put on the pill also this past year for the same family "curse".
Just have a woman to woman talk with your mom and please hold off being sexually active as long as you can, and when you finally do decide to have sex, use a condom also. Its better to be safe than sorry!