Who am I?

This afternoon I've finally got round to opening What Colour is Your Parachute? and making a start on some of the exercises and some online tests. So far, I've discovered that my interest colour and usual style are blue (Princeton Review Careers Quiz) and my Myers-Briggs type is INFJ. Which doesn't really tell me anything I didn't know before. The jobs suggested by some of these tests include writing and editing, teaching, counselling, clergy, musician and actor. An article by Marina Margaret Heiss suggests that "overall, INFJs can be exceptionally difficult to pigeonhole by their career paths." Clearly that's the problem; I don't know what I want to do, because there are too many options. :o)

The thing is, I think part of the problem is I'm scared. I'd love to write for a living or edit books or research in libraries all day, but I'm not convinced I'm good enough and I don't know where to start.