i have been struggling with this too, especially because i had quite different expectations going in.
but the thing is that what gives you joy very much depends on your own expectations, and you can change those. i believe it's the same thing as with a job. there are people arguing that you should love your job, and if you don't you should not be doing it, while others claim that most people don't have a choice but to take a job that they don't enjoy.
finding that joy may just take some searching.