Last night I went to see Christopher Paolini. I really enjoyed his presentation, especially the part where he talked about how he got started writing.
He said he graduated at fifteen mostly because he was homescooled and never took summer breaks. After about two weeks he got really really really bored. So he went outback and started digging a hole. He was rather proud of this hole as it was 8 feet deep and 8 feet wide. He then took an old abandoned satellite dish and turned it over so it formed a dome over the top. With the dome on top he placed hay bales all over it and stripped bark from the trees near his home placing them for shingles over the top of the hay. Of course now he couldn't get into his hole, so he dug a tunnel into the hole and built a door for the entrance then place sticks about to fashion it into a vicking mead hall.
At this point he decided that he needed to find something to do with himself and he chose writing.
What you choose to do when you have nothing to do at all is probably what you should make a career out of.