you dont, calm down you will get boobs around age 12. then you'll get a boyfriend around age 15 and he'll rub em and squeeze em, and lick them and suck them, soon enough you take off your shirt and before you know it your having sex
It is normal for your breasts to get larger as you grow.
Swelling and tenderness of the breasts around ovulation time can be normal.
No.
depends on when you started puberty.
Yes. As breasts grow, it is normal for them to be tender or a bit sore.
Yes.
Yes
yes
Yes
Yes, it is completely normal, especially if you are athletic.
yes, very normal
Yes, it is normal to see vatiation in your breast size throughout your entire menstrual cycles but especially around ovulation and menstruation. The breasts are not growing or shrinking, the ducts in the breasts are swelling due to the effect of hormones on the breasts.