A linguistic irritant XV

Although it's only a minor irritant, it's off-putting to me when someone says, "I found myself shaking (or tapping my toes, or drumming my fingers on the desk impatiently.)"  Admittedly, saying, "I found myself," isn't as grating to me as saying you proceeded to do something or took the liberty of doing it.  Still, why not just say you did whatever it was instead of saying you found yourself doing it?