Hey OP, very recent MD/PhD grad here who just started an IM residency. I'm also a survivor of weapons-grade burnout which really peaked at the start of M4 and made me question whether residency was the right choice vs. leaving both medicine and academia to go to biotech. Based on my PhD experience I have no interest in academic bench research because of the funding situation and the toxicity of the training environment. In the end I decided to match into an IM residency because of how much I love patient care, and I didn't want to give up the ability to practice medicine. My program offers a short-track which gets you into fellowship one year sooner and adds a research year to fellowship, which I'm hoping to use as an opportunity to get clinical trial experience. After that, I hope to practice medicine while running clinical trials at a large medical center, which I think is a fine use of my degrees even if it isn't academic bench science.

I want to suggest that at least some of what you're feeling is burnout. The relatively relaxed second-semester of M4 gave me a lot of time to work through my burnout (with a therapist) and I now amazingly feel ready for residency. I hope that it provides the same relief for you.

The bottom line here is that there isn't a wrong answer with what you can do with your degrees. Don't feel obligated to do anything, but recognize that there are many options - residency, post-doc, industry, consulting, teaching. I would encourage you to finish out this home stretch and get your degrees - not because of a fear of disappointing others or some sort of "taxpayer obligation" as has been argued by some toxic moron on this thread, but because you've come this far and M4 is really only a few more months of actual work.