I'm 15 yrs old, 5'2, 120 lbs, 32DD. Am I a good candidate for breast reduction?

Hello! Thank you for your question! I hope that these answers help in
making your decision. You suffer from juvenile hypertrophy of the
breasts, which is typically treated by breast reduction. It is not
uncommon to have the symptoms that you describe such as
neck/back/shoulder pain as well as headaches, infections/rashes, and shoulder
grooving, especially in teenagers once her breasts begin to fully
develop. The decision of whether to proceed as well as the timing will
ultimately be yours.Once one begins to have the symptoms that
you state above, consideration for a surgical procedure to ameliorate
your symptoms, assist with self esteem, and allow you to get back to
physical activities in your youth should be done. Given your symptoms,
you would be an ideal candidate. You must first discuss with your
parents and pediatrician, and then consulting with a plastic surgeon for
evaluation and examination to assist you in deciding if this would be
the right thing for you. Your surgeon will also go over what to expect
as well as the risks and benefits of the procedure - it is a safe
procedure. Overall, your symptoms should be ameliorated almost
immediately and hopefully give you more self confidence and an increased
activity level. Your breasts may still continue to grow over the next
several years, but it is certainly reasonable to consider this at this
age with the issues that you are having. I hope that this helps! Good
luck with your decision!

I'm sorry to hear about the physical and psychosocial problems your disproportionately large breasts are causing you. 
It is probable that you are dealing with juvenile breast hypertrophy along with the physical and psychosocial consequences of this diagnosis. In other words, the breasts are too large for your frame causing  both physical and psychological distress.
In my practice, timing of breast reduction surgery is determined on a case-by-case basis. It is NOT too early to do your homework and learn as much as possible  about  breast reduction surgery and the potential risks and complications associated with  the procedure.   
As you learn about breast reduction surgery, make sure you read about the potential risks/complications associated with the procedure. You may find the attached link helpful in this regard.  For example, unsatisfactory scarring is  one of the potential complications. Make sure you also understands that further surgery may be necessary in the future (for example if the breasts were to grow in size again).
On the other hand, breast reduction surgery is one of the most patient pleasing operations we perform and I think that for the right teenager (enough symptoms) it may be an excellent option (regardless of the age). Generally speaking, the best I have the procedure performed once you have reached “physical maturity”.
Sometimes breast  reduction surgery is covered through health insurance. The best way to obtain insurance coverage for breast reduction surgery involves some “hoops” to jump through. The more documentation you have (for example, from your primary care doctor, physical therapist, chiropractor etc.) the better when it comes to obtaining insurance “authorization” for the procedure.
This documentation and letter/pictures from your plastic surgeon will help you obtain authorization.
 When the time is right,  seek consultation with well-trained/experienced board-certified plastic surgeons.

I hope this, and the attached link, helps.

Thanks for your courage in posing this question.  No, young age doesn't disqualify you from having breastreduction.  The compelling reasons to have BR are 1. correct BMI (height and weight); 2. musculoskeletal symptoms; 3. prior experience with surgery.  The uncertainty is whether BR will completely reverse yourprior trauma.  Don't be afraid to ask for help from your parents, (?) clergy, consult with PS and take your timein making an informed decision.  Good luck.