How to tell someone I'm not really a believer

I have been faking my faith and being a Christian. I just recently got back from my youth group's youth camp. I am forced to go to this youth group and this youth camp. My youth group leader's wife wanted to talk to me on Sunday at youth, and I said ok. I want to tell her that I've been faking my faith, but I'm not sure how to. I also want to learn more, and am planning on mentioning that. Youth camp this year just tore me in half. Thanks. I would appreciate a answer or two before I leave for youth at 5 pm (EST) on Sunday July 22, 2012. Thanks.

Hey hun, Sorry I didn't see this post until now. My simple answer is "Just tell her." Be honest. Why do you think it would be difficult to tell her? Do you think that she will look down at you?

Since you have probably already talked to her, how did it go?