I am quite astonished to learn that Mr. Christopher Paolini, author of renowned novel Eragon is 19 year old teenager. I am more surprised to learn that he had decided not to pursue college after high school. You sure need great understanding parents and hell lot of believe in yourself. Sure I am damn inspired.
Mr. Paolini was always good at writing and has taken inspiration of works like "Lord of the Rings". There is a very good comments and advices here http://www.teenreads.com/authors/au-paolini-christopher.asp
If you are hard working has passion for what you want to do... impossible is nothing. I am damn inspired.