I want to write a book on my life should i?

well after reading twilight i figured i want to write a book on my life but with a love able vampire too should i or should i wait till i am older than nine cause i am nine but mix me instead of being the normal one i am the vampire and i am fast so fast i can beat edward and alice's speed put together.i think abut it every day just i can't seem to write the words down on paper so should wait or should i start now and finish later so i can become a famous author too