I did just about the same thing! Swiped a pack of gum when I was a little kid. My uncle was with me at the time, found out what I did, and gave me a serious talking-to about how wrong it was. Never have stolen anything since.
When there is no adult authority figure (preferably male) in a person's life to impress upon one the seriousness of doing wrong, no matter how little it may start . . . well, I think we all have seen the results in our nation.