Why do people lie?

You know you are doing it, we all do it, whether it is a small lie, or a big, we are all liars..... Life is a big show and we all actors..... But tell me why do we lie though?......Considering the fact that we know the truth will soon be out, the trouble which we will cause,and the lack of trust we bring among ourselves or have you become such a great liar that you no longer blink before a lie?.....Has it become automatic, to the point which you actually strongly believe in those lies?....Please enlighten me my friends!

L@ belle charm!