I think I stole a lot as a little kid
Did you not have supervision?
I was a preschooler who wasn't really a bad kid.
When you're a child, you don't understand that your actions have ramifications.  So even though what you might have done was wrong, you can now learn from your past and build off of it.
I was so young, I didn't understand. It was just to take fun things that I didn't have.
That's true, and most children don't really understand that they are hurting others when they steal, so I'm glad that you are coming to terms with it now.  You can't change the past, but you can use this lesson to avoid committing bad deeds in the future.