A source of stress
Wanting to do two things at the same time.
If you’re on the stairmaster at the gym, you’re engaged in a workout voluntarily.
But if your job involved standing on a stairmaster all day, every day, you’d be stressed out. Because you want to stay (you need the paycheck) and you want to leave.
A volunteer fireman feels totally different about a burning building than someone who is trapped in one.
That’s because the volunteer goes in on purpose.
The distinction (and the stress) comes down to the word “but.”
I need to do this but I hate it.
I have to stay but I want to go.
The external forces might not be changeable, but our use of the word “but” can be.
If it’s what you want to do, then do it. Dropping the “but” costs you nothing and saves you stress.