Girls Only! Help Mee. :)?

im 15. kay so when i get my period i get lower back pain and its excruciating to the point where at times i cant focus on anything else but that or even do anything. and its irregular but its because that im still a teen at least that's what i've been told. would birth control be a good idea for me to take to regulate it and stuff? and also how should i tell my mom that i want to be put on birth control? she hasn't given me the sex talk or anything (even though i already know about that) so i have no idea how she would react. help me please and thanks in advance :)