Are my boobs too big for twelve??(Please girls answer only)?

I'm about between a 38 and 36 B almost a C and every time i go shopping in the girls section i can't find my size idk maybe i should be shopping in the juniors section now my boobs are bigger than most of my friends except for a couple of them were about the same i'm just worried because i can't find my size do i need to shop in the juniors this time around even maidenform doesn't have my size in their girls section.