Help me!!!

I am currently 16 years old and a Virgin with a boyfriend of 10 months and I have extremely bad cramps to where I sometimes can't walk and Midol/Ibuprofen doesn't seem to help either. I'm also changing my tampon (Ultra Sized) a good 4/5 times a day. I was really considering asking my mom to get me on birth control to help regulate my menstrual cycle (which is also a 42 day span in between each one) and because I've been thinking about possibly getting more intimate with my boyfriend after I have been on it. I want to the birth control for the main reason of my period and to also be safe just in case we consider to move our relationship up a notch.