Do you believe in the concept of "lying by omission"?
Personally I don't. A lie is saying something that you know isn't true. Omitting something can certainly confuse people depending on the situation, but I don't think it's lying outright.
Also, sometimes it's just better to shut up. I mean, who wants to run around the neighborhood telling everybody about the time you pissed your pants in kidnergarten or whatever?(Not that I did, I was fully potty-trained before I started school.) But you get what I mean. You'd be honest, but did everyone really need to know that?