What's wrong with thinking about the virtues as duties?

My parents taught me ethics in terms of "duties." So being honest and just was a duty, along with "sharing" and "selflessness." They were simply "the right way to be," period. Now, I tend to think of the Objectivist virtues -- rationality, productiveness, honesty, justice, independence, integrity, and pride -- as duties. I have a duty to myself to act in these ways. Is that right or is that a mistake?