How do i know if i am a true artist?

i've always wanted to know, i can sing too but that question will be asked latr on , anyway im into art and when im in art clas i c alot of people working and they are very good but i cant compare myself to them so i just whineup sorta copying them. sometimes i do make good artwork but i want to find out very very soon . and i dont know if i am or not a good artist. caan any1 help mi? plzzzz and btw yes im 12 years old and i nvr evr talk to noone in the internt