Worsening back pain

Elaina
Okay so I am 14 years old and I am getting really bad back pain. I have bad posture because I am a DD but I can't keep my back straight all of the time to train it. It is getting worse and is effecting the way I sleep, walk, and even just exist in general. I am unable to get a reduction in til I am 16. Does anyone have any way I could make this better? Thanks