I admit I also find the protagonist's attitude refreshing realistic and infuriatingly pathetic at the same time. But given all the focus his hesitation gets, I'm v convinced it's part of his character arc.
Just don't drag it for too long. When basically the rest of the cast, even those who awakened as gods very recently, is kicking ass despite being very aware of the risks, it's not as fun when a scared hero refusing the call (trope!) hogs the spotlight.