Trying to explain ADHD to my best friend who doesn’t have ADHD

Have any of you been able to explain to people without ADHD what it’s like?

To give context I was talking to my best friend about how I finally got myself to shower after like two hours of wanting to but struggling to do it.

And she said she can’t understand that inability to do something we want to actually do.

I tried to give some other examples to her and explain how time constraints and pressure can push me to do it.

The closest thing she can relate to is procrastinating but she’s aware what I deal with is different.

Does anyone have any good comparisons or examples or better ways to explain this?

Thanks!