What am I hiding

I cant really remember the last time hid something but if I did people would know that i was pretty fast because I am not the best at keeping secrets. I think that keeping something hidden can be a good thing and a bad thing. like stealing something and not fixing what you did is bad thing but lets say that you were planing a surprise party if you told the person you were planing it for it kind of defeats the purpose of the "Surprise!" Part.