I stole over $20,000 and am still in the store's database

I work at a local change store. One day, my manager wanted to make a money order of $1500 to pay the company's insurance. Some ungodly amount. I've been working at the store for quite a while. I know the store and the manager like the back of my hand. I know what security cameras watch what and i know what ones are currently broken (from the cameras that are broken to the ones that are only for show). I work at night and the manager and i are the only ones here. I simply made the manager do the money order for $1600 instead. Giving the manager $100 and me giving myself $400. As far as i know, they change the codes every 6 months. This is currently my 6th month of doing this of getting away with this. I've never been caught and i never will be caught because i know the manager and store's numbers and codes like the back of my hand. At this rate, i've made over $16,000 and counting. I simply have made this post to just let one person know. I'm not happy with this and i feel terrible. It's not a good feeling, but not enough to stop.