Designed For What?

One of my teammates the first summer I went to China asked us a simple question that has stuck with me ever since: Have you ever felt like you were doing exactly what God designed you to do? At the time, I answered, "Yes, right now," and that's why I went back. There were some challenges and struggles living in China, to be sure, yet if circumstances had been different, I'd probably still be there. In fact, I pretty much think about it daily. So why don't I go? Well, mostly it's a financial thing. Not so much about support-raising, but about the sad state of my IRA. There are other fears that deter me, too: traveling alone, never meeting anyone I might want to date/marry, gaining weight again... Still, I can't shake this feeling that I'm supposed to be there. Is that a God thing, a "calling" perhaps? I wish I knew...