Like…I have some things I have vague interest in, I guess.
But not anything I have ever put time into, or am good at, or am knowledgeable enough to hold a conversation.
Maybe I’m just depressed…maybe I’ve always been depressed…or maybe I’m just missing some kind of spark most other humans have.
Like how does someone just know or decide like…”yeah I’m really into architecture.”?
I don’t know if I’ve ever felt like that…I feel like I’ve tried and it’s never lasted.
I feel like I’ve spent half my life just addicted to social media and video games and that’s no longer working.
I agree that it sounds a lot like you're describing dysthymia but a hobby doesn't need to be something that you are good at or an expert in; you can be a terrible artist or a cook who barely knows how to make a single dish and that's completely fine because a hobby is something you do because you are passionate about it and you find it personally interesting or rewarding on some level. Some hobbyists are extremely knowledgeable and skillful in their interest but many - I'd argue most - are not, and that's completely fine.
If you bounce between hobbies, that's completely fine. Maybe you haven't found a consuming passion yet or maybe bouncing between hobbies is what suits you best. Or maybe life is particularly demanding or your mental health isn't great and so you can't dedicate much time towards hobbies right now, if you can dedicate any time towards them, and that's pretty common too.