Too young?

i'm 13 and nervous. i have a lump on each breast and am wondering if this is normal. Is it? at first, the lumps would come, and go, but now they are always there and hurt a little sometimes. PLEASE tell me if this is normal or not.

[CCF-RN,MSN-JS]

Dear L.i, Breast tissue is not altogether smooth, sometimes you can feel a "lumpiness" in the tissue on a breast exam.  Sometimes with the menstrual cycle you can feel changes in the breast, or have more tenderness, all of this is normal.  Also your breasts could be experiencing changes related to growth.