[benkoller]

I'd second that, somewhat. The things I'd consider myself to be good at are the things I care about. I can still quite clearly distinguish between personal and "business" interests, and don't feel a blurriness between both if I do not want them to blurr, but it is the one thing that has helped me (apart from being at the right time at the right place) to progress in my career.

What I'd take away from what both godelski and me are saying (if I were you): Find topics that sound interesting to you, dig your heels in, learn about those, play with the concepts. 9 times out of 10 something will come out of it, and if its just yourself understanding better what you're actually looking for.