^
Some girls are very early bloomers, some very late.
I remember when I was 16 and a girl neighbour who was 6 years younger than me had the same development as girls my age, she told me she was 32C once out of the blue and tried hitting on me a few times but she was butt fugly.
There was also this one girl in my class, and she looked like a kid even at 16, I had bigger pectoralis major than her, my female friends told me she hadn't even started mensturation.