Sometimes you just have to let it out. Telling anyone, even anonymously on the internet can relieve a lot internal stress due to a secret you've forced yourself to keep.
Cousin died when we were both seventeen. There was a reception at his house just after the funeral. I went into his room and stole all the money that was there, took some other valuables that his parents wouldn't realize were gone. No one knows that I did it, they just assumed he didn't have any money in his room, only loose change. I don't regret it, but I will never admit I did it Source