Books to help me be okay with doing nothing?

This year, I’m doing something I never imagined I’d do: I’ve taken a year off work and am going to be travelling solo later in the year. However, I don’t leave for a few months, so I’ve just been working casually until then. I’ve got a lot more leisure time than I previously did and I’m finding that I really struggle with just relaxing and enjoying having this time to myself. I constantly feel guilty and like I’m wasting my days by reading, going on walks, watching TV shows — nice things that I’d always wish that I was doing when I was at work. Now that I have them, it’s like I can’t enjoy them. It makes me worry that I’ll struggle with this while travelling as well.

So, are there any books that might help me relax and enjoy leisure time without feeling guilty? Help!