Honestly, it's probably a good thing that you didn't learn anything from this experience, OP.
If you had the proper perspective to understand that you threw away a potentially cushy corporate gig for a retail position, it just might be one of those things that haunt you forever.
ESPECIALLY since this job was gifted to you through special connections, despite your total lack of relevant education and work experience in the accounting field. At age 28, you're not a young person anymore; you should be starting to enter the early phase of the mid-career portion of your professional life, and at this age it's an very difficult to be able to switch gears professionally, without going back to school. Being given a foot in the door and starting fresh in a new, respectable field is an incredible professional opportunity nowadays, and you wasted it over pettiness.
So, yeah, a little denial might not be the worst thing for you here. Gotta be able to sleep at night.