If you've told one untruth in your life, are you not a liar? How can you claim to be otherwise, even if you're brutally truthful now?
I had a coworker years ago who was quite a bit older than me, but we became fast friends. He always used to say to me “Young Lady, there’s a sure fire way to tell when you’re lyin’...any time your lips are movin’ ”
lol he was the best:) ... and that should answer your question :)