I cheated on my math test the other day. I felt pretty rotten about it.
What prompted you to do that?  Did you tell someone and clear your conscience?
I haven't yet - you're the first that I've told. I have a feeling I won't be able to sleep tonight.
Best thing you can do is tell the truth and clear it up. Its not worth it and you only cheat yourself.  You can do it and you'll feel better.