Some people are good at telling lies and some are not. I don't believe this. If its really something you want to hide, everyone automatically becomes a pro at telling lies.
I bet all mum's say don't tell lies to little kids. Bad things happen to people who lie. I was a good girl, listened to mummy. Don't tell lies. But one incident changed me. I was accused of being a liar in primary school by one girl. I remember it very well. She glared at me and said: LIAR! I felt so stupid I should have slapped her silly but instead I turned away.
Then I realized telling the truth is stupid. Even if you're telling the truth people don't believe you. But evidently I'm still an amateur at this. Compared to you.