If you have a small bust don't panic try my advice it totally rocks: Don't touch them, pretend your a boxer and punch the air, put your hands in a prayer position elbows out and push your hands together,or rub butter on them every day instead of lotion it works.I'm 10 and I wear a 38C.
Exercise and eat everyday at the same time healthy diet,,,,good luck
Different women are shaped differently so maybe your fat goes to your stomach and not your butt and maybe having small boobs are in your genes. Just be comfortable with who you are and love yourself for the way that god made you.