Are my too small?

lol ok weird question. well I can't really post a picture, but I'll describe my proportions. I am 5'7, about 125 lbs (mostly muscle). My body is super toned got female abs, definition lines on legs, wear size 00 in female jeans and even then 00 can stretch wear an xs or a s in female t-shirts. my bras are 34 B, although when i wear that size it pretty much covers my entire and is sometimes big. when i ask friends they all say my are perfectly proportional to my body, but was wondering what others think also if I exercise my and make it a lil bigger do u think that would throw my body out of proportion oh and i slouch so i think correcting my posture would make my s look bigger if u know of any exercises that help the appearance of female please share thank you