Why is this so i dont get it??

i get called a little girl all the time and i get patted on the head and called cutie or cute altho i am a child im just very youthful for my age and immature lol but i look alot younger than i do i look about 10, 11 and 12 years old thats how small i am but i just turned 14 but im veryyyyyy verrry smalll for my age and im very immature (hate to admit it but its true lol) but why do i get called that alllll the time (when i say im 14 people dont beleive me) im not tall enough to go on alot of rides at the fair