What is life, if it is all a lie?

I find it unbelievable. Shocking. Unfathomable. How is it possible that some people are incapable of forgiving, incapable of compromising, incapable of saying "sorry" and admitting that one cannot be "right" all the time. Humans make mistakes. It is true, we are not perfect people, and we often make mistakes. I think the most humbling thing a person can do is to admit that he is in the wrong, and to simply say "sorry." It really is not all that hard. I find that all easier to do than to be dishonest to one self. How can one live with such dishonesty within? Does it not eat a person alive? For what is life, if it is all a lie?