I want to do things but I don’t want to do things

It is often falsely described as “being sad”, leading people to not realize that they might be depressed.

I think it is more aptly described as “apathy”, i.e. losing interest & motivation for most things and just your life generally “losing color” (some say quite literally). But ofc that is very gradual and some of it is also just a side effect of getting older :-/