Do you think I have a child like figure?

I am 13 years old and am 5'5 98 lbs. I am female and all of the other girls are curvier and gaining weight. I went out with my friends yesterday and they thought i was their little sister. Is there any way I can look more womanly? I eat alot and wear makeup and frilly clothes. Do you think i have a childlike body? What weight do you think i would be?