I'll be honest here.  Sometimes it's just easier to lie.  It's not that I want to be a liar.  It's just that some situations are made more difficult by telling the truth.  For example, if an acquaintance asks how I am, I respond with some variation of "good," because that's what you do.  The question wasn't asked to elicit a response about the intricacies of the negative things in my life.  It was asked as a sort of long-form greeting.  Another example is when the topic of my job comes up in conversation.  It's kind of complicated.  Not too complicated for normal people to understand, but complicated beyond the scope of a casual discussion.  Instead of listing examples of what I might do in a typical day, I just say I do math problems.  Is that so bad?