Big Boob Back Pain

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Hey guys, I'm 16 and I have 32D bra size. My back has been hurting really bad  as result of my boob and the bras I wear. My mom isn't open to a chiropractor and says it's just stress. I've tried to stretch it out and Advil usually doesn't work. Some days I can't even wear a bra it hurts so bad. Helppp??