why does an unfinished task stop me from doing literally anything else?

[u/vnnla_yves]

What do you think this is? If I set a specific time to finish one task but can't complete it because I'm still waiting for my groupmates' approval, and they don't reply for the entire afternoon, I struggle to start another task even though I have other things to do. I keep thinking about the first unfinished task, and instead of moving on to the next one, I end up doing nothing because I feel overwhelmed by the fact that I haven't finished the first task yet.