I found a wallet and didn't return it. Right before Christmas

While on my way out of an auto-parts store I found a wallet on the ground. Instead of returning in, I jumped in my car and drove away. There was about $500 in it, along with the guy's ID and everything.

I was out of money at the time and it was right before Christmas. I took the money then dropped the wallet back in the parking lot of the store. I figured at least I could return the guys wallet and ID and credit cards and stuff. I still feel bad about this and some days I think about driving by the guys house and giving him the money back.
But I don't and I will probably still feel like shit unless I do something about it.

Name kept secret
Location kept secret