Eh. I already don't lie. It's not that hard. Just be strict with yourself and think about what you say, and why. You don't have to lie. It doesn't solve anything.
And yes, that is true. I'm a mythomaniac. If I get started lying, I can't stop. I'll make up the most ridiculous stories, I'll "prove" them, I'll convince everyone I'm right, and I'll get away with it too, most of the time. I'm a really good liar.
That got me into trouble after I forged an email from my mother to my teacher to get out of school for a while, and with an earlier "friend" of mine that wanted to kill me. Taught me my lesson, since then I've done my very best to keep from lying. I won't claim that I haven't ever lied since, especially to my parents I still do it, but I've done pretty well, and gone several full months with no lies, the past three years.