I speak a great deal (here & everywhere) on self- and other-awareness. This is from a journalist and an amateur, not an actual psychiatrist or psychologist, but well-summarized (and just a piece of the big picture, but a significant one).
I would have left off the last phrase (over-emphasized and too limited) and worded the whole thing a bit differently, but it works.There is branch of psychology and an old-but-growing body of research with findings that suggest you have little idea why you act or think the way you do. Despite this, you continue to create narratives to explain your own feelings, thoughts, and behaviors, and these narratives – no matter how inaccurate – become the story of your life.
He adds this below, which is also not how I would put it (too sweepingly presumptive and overstated for one thing) , but useful enough. Though it's hardly a "bulletin alert" for most of us, it still gets regularly ignored in self-monitoring.
You seem to be able to see other people deluding themselves all the time – your friends, your family, celebrities, politicians. The mental pratfalls of others seem so obvious, but you have a hard time seeing those shortcomings in yourself.