I Am Christian

I don't know if I'm just being narrow-minded in this situation: not lying are one of the biggest command of God. But what if you use it for your own safety and protection? Like to covering up some of your flaws or about something that could make you embarrass? Or to protect from some people that could take advantage of you?
Sorry, I'll admit I'm a little bit fool! Can someone help me more understand? It's seems like I became more narrow-minded when I became a Christian!
Thank you!