It sounds as though you could possibly have fibrocystic breast, which is just another terms for lumpy breast tissue.  I found out I had this in my left breast after I had already went through a mastectomy and chemo.  Each lump brought such fear.  I would mark them with a sharpie marker and track them and most times within a couple weeks they just went away.  When I did have a mammo and ultrasound done that was when I found out that I had extremely lumpy tissue, so everything felt like a knot but nothing showed up on either test.  I know it can be rather scary.  Just keep up on your self exams and track your changes.  If you notice anything unusual consult with your doctor. But as PJ said, you're also experiencing a lot of changes related to puberty and your hormones; so what you are experiencing is fairly normal. Good luck to you! Angi