Early Life Crisis?

How do you explain a bachelor's degree in Political Science, public policy thesis work, field experience in clinical psychology, volunteer experience in psychiatry, and work experience in investment banking?

I was asked this question in an interview a few weeks ago and quite frankly it was one that I found harder to truthfully answer then the one that followed, "why alternative investments?" (lets be frank, aside from a volatile market, investors looking for alternative ways to preserve their capital, blah blah blah - I just wanted a job and this one was open, luckily at great firm) Whatever happened to the days when the quintessential 'what are your weaknesses?' was the hardest question to answer?

For someone governed by logic, who measures success objectively and integrates empirical data to prove points in every day life, I have found that the only thing in my life that isn't so black and white is my resume. I'm all over the place! Which begs the question, are ecletic interests and experiences an indication of enthusiasm and a love for learning? Or someone who is whimsical and capricious at best?

Either way, I'm beginning to realize that it doesn't matter as long as I'm doing something and gleaning knowledge and skills while at it. I can't decide what I want for dinner tonight, how can anyone expect me to know what I want to be doing in 30 years at the age of 21?