It doesn't mean you chose the wrong major, you didn't work long enough on your dissertation, you didn't present at enough conferences, you held your glass of water in the wrong hand at your one MLA interview. It means you didn't find work teaching. And now you're looking for work in another field. We're not talking about looking for redemption, looking for validation of our intelligence or talent, or looking for UFOs in New Mexico. We're talking about career switching, and that's not shameful, wrong, or crazy.
People switch careers every day.
When I finally took my non-academic job I had been teaching for almost 10 years. Between four and ten years is exactly the time frame when most people who have been working full time since college look into changing careers. What we're going through is normal in the business world. Resist seeing the job hunt and the possible career switch as the fundamental stuff of your lives. It's about finding work.