I shoplifted when I was 13
Why did you shoplift when you were 13?
There were things I wanted but I couldn't afford to buy them.
You know that you shouldn't steal. It's great that you understand that or you might have ended up in prison if you continued to steal things. Stealing is wrong and you could have ended up in jail.
I wouldn't have gotten caught, I was good at stealing things.
Stealing is wrong and saying that you were good and wouldn't have gotten caught doesn't matter. You shouldn't do something that's illegal because one day you'll have to ay the consequences.