"Jack of All Trades - Master of None". That's me. :P

I prefer the term "renaissance woman" or "dilettante", though. They have a bit more. . . cachet.

I also console myself with some findings published in the Harvard Business Review: when hiring for a senior position, specific applicable experience is not a good indicator for success, while general abilities (to think on one's feet, interact well with people, etc.) are a much better indicator. So perhaps my lack of a "field" shouldn't bother me so much. :)