This is a great question which is frequently asked by my patients. It's really important to try to help patients understand what options they have and why, but doing a good job with this might be one of our hardest challenges as surgeons. Sometimes patients with really excellent outcomes are unhappy. This should never happen, but it does. I completely understand how someone your size would feel way too big, and unfortunately with age, your breasts typically get bigger. Not necessarily only in terms of volume, but also in terms of length, which may be just as troublesome. Having breast reduction surgery when you are young is, in my opinion, a great idea. Being young makes it even more crucial, however, to have a healthy functioning breast...with good circulation, natural appearance, and functioning nerves. The smaller you try to get, the more chance you will risk problems.Long story short, you cannot choose a specific size and it is not possible using techniques that limit long term functional deficits to your breasts to become an A cup. It is possible to go from being way too big to simply big in one operation. For you this would be a B. Start with finding a surgeon whose patients are happy and whom you like. It sounds like you are an excellent patient for this procedure. Best wishes. I hope this helps.