Sorry to her about your problem. A fibroadenoma
is a benign lump in the breast
which is very common in your age group and it does not increase the chances of cancer. Sometimes the lump disappears on its own but if it is more than 2-3 cms and causing you trouble, it is best to get it surgically removed.
Surgical removal can either be done by open surgery or my mammotome
guided excision (which is scar-less surgery).
You should consult a breast surgeon for your problem.