Other than potential physical issues with my body and mind, this is probably my biggest issue. Somehow I've never learned how to relax and how not to min/max everything for productivity. As a child/early teen, I used to despise sleep because it was a "waste of time" and I wasn't being "productive". Now I constantly feel bad if I'm performing at 100%, which results in me feeling terrible after a week of work where I didn't accomplish 90% of what I wanted, but I still blew my management away with what I did (not always, but often).
I think I'm still working through the unstructured period of just stopping work, but I'm hoping that once I start to really settle into this free time, I will learn how to slow down and actually relax. Sit down, read a book, and don't worry about how quickly I'm reading, what projects I should be working, what I have to do later in the day.
For the rest of your comment, I do think I genuinely enjoy my current position and its goals. It's not something with high morals, but it's valuable, OSS (very important to me), and I can have a huge impact in how people interact with computers (kind of my main focus with my work). I have poor relationships with my parents, but I don't communicate with them often, so it's not really a big deal.