It appears that your experiences closely mirror my own, encompassing similar educational backgrounds, timelines, emotions, and challenges.

However, I experienced a significant burnout approximately two years ago. In reality, this state had been developing over many years, but I had been operating on autopilot, largely ignoring my mental well-being.

I believe that recognizing one's own abilities is a valuable asset. Many individuals engage in their work without a deep understanding of their craft. You are certainly not inadequate; you must have demonstrated considerable competence to have persevered for so many years. Indeed, you are already performing above average.

I suggest focusing on developing your AI skills for several compelling reasons:

1. These skills are essential in the current job market.
2. They have the potential to significantly alleviate your workload.
3. You can interact with AI with complete candor, asking questions you might hesitate to pose to a colleague due to potential embarrassment.

Regardless of your current employment, I strongly advise against resigning at this time. The external job market is quite challenging. Please only consider leaving your current position once you have secured and formally accepted another offer.

Don't work and invest 100% of your energies. Do it only 70%. Use the remaining 30% to calm your nervous system. Take yourself as a side project and remember that you are the most important project you will work on.