You will be a d cup or double dd
Okay, the 36 or 34 is are the inches under neath your breasts. The B is the breats cup size. So 34B is two inches smaller then 36B. Hope I helped :)
well it matters what size you are
A 34B would be for someone whose ribcage equals 34 inches and their bust measures 36 inches, since a B cup means there is a 2 inch difference between the ribcage and bust, so yes, a 34B is small. It is also a very rare size on people who have been properly fitted.
34b is bigger.
There are some females fully grown with same size or even bigger.
You should were thin bras so as to keep your breasts safe and be sexy.
Try a 34c if the have it. If not try every brasize between 34b and 36b
At this age your breasts are still developing so don't worry about your size, becasue all women come in different shape and sizes. When I was 13 I was a size 34B.
Size 34B
34B
34B