Diamond,
I am a man. My wife has almost flat breasts, the areolas are average but her nipples are disproportionate and have fully the cylinder button form. After many years, I keep wondering that they protube so much, event when quiet. When erect, they are longer than large : almost my fingers width, i e just over 2 cm. Really.
I did not choose her primarily on physical criterias, by the way. I feel the nipples compensate for so flat breasts (though I am a huge tits fan).
As for her, she has difficulties in finding padded bras, that can hide her nipples, but fit A- breasts.
That is all for it. My wife has bigger nipples than you, so be aware that you have overdevelopped ones, but that you are not alone and not freakish.