Friends stole from my employer

When I was in high school many years ago I worked as a nanny. Two of my friends stole marijuana from their garden while I was out of town. I still have shame, guilt, and remorse that this happened. I’m the one that told them it was there.

Doing some of the model work has revealed a belief that I’m not a good employee and that I’m a bad person. I can see how this interferes with applying for jobs. What is the best way to use the model to forgive myself and stop punishing myself?