Could Back And Chest Pain Be Due To Large Breasts?

Em... hi. I'm 14 years of age and my breasts are larger than most of my school years. i am currently in a 40DD bra and for the last few years i have been getting back ache and i am unsure if it is because of my breasts. i just really need help to find out the problem so i can find the best course of action to sort it but the back ache has been getting worse lately and i constantly have chest pains around my breasts.