If you think you haven't, you're just lying to yourself.
If you're being honest, lying is probably a big part of your daily life. Even if you're not running a pyramid scheme or cheating on your partner, little "white lies" or "untruths" likely fly out of your mouth as regularly as planes do at JFK Airport. Sometimes it's out of kindness, sometimes it's out of convenience—but either way, it's a lie. And that's the truth.