cantekin89 wrote:
I can't delete Apple Music because I need it to listen to music on my iPhone 14.
That's your choice.
Also, deleting Apple Music doesn’t solve the issue.
It would.
Even when Apple Music wasn’t installed on my computer, I couldn’t use iTunes with my iPod anymore.
Then there is a different issue. You would need to describe the symptoms encountered before anyone could help sort that out, but not until and unless you abandon the new apps (mentioned again below).
That’s because the latest version of iTunes doesn’t support music.
I can assure you that it does. I use it.
When I open iTunes, I get a message saying it only supports podcasts and audiobooks.
You mean that the display shows only Podcasts and Audiobooks. As far as I know, there is no "message". That indicates that you have installed the Apple Music, the Apple TV and/or the Apple Devices apps. If you uninstall them you will see all of your library.