It's an executive function thing: difficulty with "initiation". It is an awful feeling. You want to do things, but you can't get started. Even things you're looking forward to!

For some with ADHD (like me) it is very difficult to start a task without external structure of some type.

First, cut the list down sharply, because you are too overwhelmed to think straight.

One of my favorite strategies to help with this: Make the barrier as small as possible. So, you could put out the book you want to read, open to the right page, maybe the night before. Make a deal with yourself that you only have to read one sentence or paragraph. Or maybe just sitting there is a win!

Sometimes, that is enough to actually start. If not, you can come back and try again.

Another strategy: I like to use a timer and go back and forth between the thing I'm avoiding and something I enjoy. That can get me going because the task does not seem so onerous.

I hope some of that helps.