I read through this post by Matt several times and thought it was a great point to begin thinking about one's future career possibilities.
This type of excercise can drive people a little nutty, and a recommendation if this is you. When asked about your Vision, Values & Passions, Strengths & Skills, the best place to turn is your past. Starting at about the age of 13 or so, look at each segment of your life and remember those times you enjoyed the most, those things you easily accomplished, stuff that others noted about you which resonnated fully with your being, as well as those things that are the opposite. Write them down, with one column being "This is Me", and the other being "Stuff that's not Me". Or maybe, "Things I love to do" and "Things I hate to do". Again, break them down by time segment, e.g. Jr. High, High School, College, 1st Job, 2nd Job, Grad School, etc.
The outcomes from this should help you to craft your story, and assist you in answering the tough questions that come up when people ask you about what you're doing, or what you've done, and what you want to do next.