This is normal - most women get tender breasts after ovulation up until their period starts

Are they growing?

Incomplete question.

Breasts are there because when a child is born a supply of milk that is especially designed for a newborns diet is available. some females feel that breasts are also important as a part of their sexual attractiveness, this however is more a case of vanity the importance of which changes from culture to culture.

Ive no idea... and im in the same situation...