I would be pretty nervous about saving the world. Here are a few reasons why;

1. Would the Hylians get mad at me and kill me or something if I failed?
2. Dang, Link doesn't eat or sleep? Man...
3. Who knows what stuff is out there?
4. Too much drama. I always cry when something sad happens... What would Zelda say if she saw Link crying?
5. It would be embarassing.
So there's why.