How can we tell what our tafkid in this world is?

The Chofetz Chaim explains a way of knowing how we can know what our tafkid, our role in this world is supposed to be.  He says that when a soldier goes out to war he can look at the tools that he was given and know what he is supposed to do.  If he was given pots and pans, he knows that he is a cook, and if he is given weapons, he knows that he is a soldier.  In our lives we have to look at what tools Hashem has given us and  from that we can know what is expected of us.

from a Shiur by Rebbetzin Kalmonovitz