Action, Results and Happiness

The most famous message of the Gita often quoted as:

"Do your duty, do not expect the results of your actions."

...gives an impression that we are expected to be more or less robots on this earth just bothered about our duty and stay detached from the outcome. Let me rephrase it, and then its power becomes a little more clear:

"Do not rely on the results of what you do to be happy. Happiness is your birthright! Enjoy it whenever you want it by making your action as the reason for your happiness rather than its result!"