I am 30 and last week I had a mammo and us after telling my doc I had both breast hurting and it was only relieved with my cycle. The us found a very small nodule and cyst and they gave it a BIRAD 3 score (probably benign). I had a 2nd opinion with a surgeon today and he told me that since it is a little bigger than a centimeter, they suggest removing it although he thought it was a fibroadenoma. I am scheduled for day surgery next week. I just tell you this because at any age, there could be something there, even if it is benign. I am lucky and have a really great doc. Push your doc further, they can't let you continue to have pain with no workup. BTW - me, my doc, nor the surgeon could feel the spot. For that they are doing an ultrasound right before the surgery to mark it with a wire.