I Want To Be A Professional Actress

I`m 13 yr.s old and i want to become a professional actress but i dont know where or how to find an agent plus i don`t want my parents to find out just yet incase they don`t approve of my dream job im very serious about acting but don`t know how to get noticed big time acting has been my only dream since i was like about 4. If you have any information on how to get an agent or get noticed big time please reply to this thnx in advance.