I don't have a good answer for you: I struggle with this problem myself. The best I can suggest is to try out a lot of things, to see if you'd find something that was practical and which you did enjoy.

Like, isn't the whole point of a job that it isn't fun, and that's why they have to pay you to do it?

Not necessarily: even if a job was fun, you would still need money to live, so your employer would still need to pay you.