TIFU by committing fraud

I work at a company that has a rewards system. It’s a little rough to get people to signup so eventually I decided to create me own account and use it only when customers decided they really didn’t want to signup in order to help my percentage. As time went on, I realized I racked up a significant amount of rewards and chose to use it (few hundred dollars worth). As a result however, systems were alerted and I received verbal reprimand for good reason. I never thought much of it and honestly believed it wasn’t a big deal but now looking back at it, I realized I’ve been committing fraud this entire time. I’m worried my managers look at me differently now and I can’t help but think of this all the time. No matter what I do the lingering thought that now i’m technically a thief stays in my mind.

tldr: I exploited a rewards program and can’t get over the guilt of technically being a thief.