I don't know sorry :)
Female breasts stop growing and developing by age 18.
your fat
because they are growing
Genetics
because they are growing.
Are they growing?
no
When your breasts grow, you will get a knot or lump in the middle of your nipple. If you hit it on a wall or desk, or anywhere really, it will hurt extremely. Even if they just hurt for no reason, they are growing.
There growing, or your hormones are at a high level.
It basically are fancy words for "when your boobs/breasts are growing".
They are growing!