My 1st piece of advice is to audition for/participate in a show (school/community) asap. That way you can see if you like being in theater. It’s great- but not like what you see in High School Musical or Glee. If you DO like it, you are taking good steps to begin. There are lots of stories on CC and in the theater world about people who started late. My own D did shows in HS with a boy who did his very 1st show at the end of sophomore year, got into a great college (Ithaca) and appeared on bway last year. You never know. BUT - I would still say the 1st thing is to do a show- I bet it will have improved since 3rd grade 