Convincing my mom to get the pill

Because my cycle being pretty irregular, my heavy flood and my bad cramps and backpain (+ also headaches sometimes) during my period AND my acne I would like to go on the pill, but my mom doesn't find it a good idea because she thinks it's not needed to already have this 'crap' in my body on my age (I'm 16 by the way). How can I convince her?