At high school I had collected quite a lot of change from the dinner money and one day my mum said I had enough so just take that. So when I went to pay for it I had to count out loads of small change and it took ages. The woman at the till complained and told me to hurry up and some of the other kids behind me in the queue started yelling at me too. And because I was so soft I cried about it.
So after that I tried to use some of the change but I started keeping some of the smaller change and putting it in my money box. I didn't think this was "stealing" at the time though it obviously was. All I cared about was avoiding the humiliation and getting told off for having too much small change and taking too long. I just didn't want it to happen again.
Of course I could have told my mum what happened and that I didn't want to take loads of change, but I was too upset and ashamed.