It's natural to lie. But there are some lies, which go over-board and we even feel guilty for hiding it from the parent.
It might be a life-altering decision you chose to lie about. But nevertheless, it's a lie. The only thing that I feel guilty about is hiding my opinion on something that might change my life and hers. I deliberately chose not to tell them and in a way, I'm hiding it, which means it's a lie of some sort.

What is your big fat lie that still goes on with your parents?