Ohkk , i really need major helpp . Dx?

alritee , im 13 years old and 5foot 6inches im currently in a size 9 in pants ..... im now on a diet and its working ! ;D i only drink water and im now a vegatarin and work out everyday ! anyways, im looking forward to either being a size 4 or5 but im not sure if i should go smaller lke a 2 or 3 ? or bigger like a 6 or 7 ? im lost !! .in whats to big and whats to small . . .-_- helpp ?