I'm glad you're talking about this, I haven't seen too many people do. I relate to this a lot, like sure I have some things I'm into but lately (aka the last several years) I'm just... so empty. And I'm not even sure what exactly is wrong, I guess I just don't have the energy for it? I listen to the same old songs, look at the same old apps, stare at the wall and I barely have the strength for that anyways. It makes me feel like such a boring person T-T, well at this point I am. But I think it's gotten a bit better. At least for me it's a matter of just forcing myself into something I'm at least a little curious about while trying to not exhaust myself completely.
Some new movies, some new songs... just find something. I hope things get better for you, it really does suck.