Suggest Remedy For Over Sized Breasts

Hello There Im Leah And Im Worried About A Few Things.
Im 15 Years Old And My Boobs Are Very Big Already Im Around About A D cup Maybe Even DD Cup And They Are Giving Me Back Pains And They Feel So Uncomftable. I Think They Also Make Me Look Fat And Make Me Look Like I Have Very Broard Sholders, And I Can Never Find Tops Or Jackets To Fit Me Right. Im Also Slightly Flabby On My Legs Ans More My Tummy And Im Inbarrised To Wear Tight Clothes Or Bikinis And In The Summer I Get Hot Cuz I Cant Wear Nice Clothes Any Ways I Could Get A Little Skinnier Or Fitter? x