I know a ton of people in person who read a lot for pleasure, but I'm sure it's kind of self selecting. Are you in college? College was the time in my life I read the least.
Also, while I haven't been to prison, I've been to jail for a short cannabis related stay in the early 2010s. There is just so much less to do there that I ended up reading a whole book (2-300p) every day I was there. Many others had a book, but I'm not sure they were actually reading them. A lot of people in there were reading the Bible or some religious literature. Anyway, just my anecdote.