When will I get my ?

This is really embarring to ask, but I'm desperate! I'm 14 and I only have 42 A's. My 2 other friends have 24 C's and 42 Double D's. My C friend is 1 year younger than me and my D friend is as old as me. Neither of them have eating problems. I have another friend who's somewhere in her C's too. She's 1 year older and no eating problems. My mom only bsrely has C's and my grandma on my father's side has E's. When will my s grow?