You often hear that you should "follow your heart." But sometimes, you can't follow your heart until you find it. You need the cause before you have the following. If you haven't heard that "still, small voice," don't be discouraged. What if there are no inklings? What if you can't hear them? Just keep trying, baby. Try new things, read more books, see more films, go to new places, try a new dish...try. Something, someday will click.
Here's a book that you could try...something I read back in 1997!!! Can you believe it? It's called, "Your Heart's Desire," by Sonia Choquette. You can find it here: http://www.amazon.com/Your-Hearts-Desire-Instructions-Creating/dp/0609800116/ref=sr_1_1?s=books&ie=UTF8&qid=1357519898&sr=1-1&keywords=your+heart%27s+desire.
You might be able to find your heart there, too. (-: Happy hunting.