Why am I jealous of people in unskilled and/or nontechnical jobs?

(like cashiers or fast food workers or even teachers) When they go to work, there aren't any catastrophic consequences if they make a tiny mistake. They just fix it and go on. But if I mistype a command on my keyboard, the effect could very well be irreversible or very expensive/time consuming to fix. There isn't any unfathomable problem they have to solve. They just have to show up and do their work. Then they can go home. When I go home, I'm still worrying about the problem I am supposed to be solving. It is so stressful, and I am really starting to feel burnt out.

Of course teachers have to worry about their students, but to some extent their obligations end when they finish their lesson plans, grading, go home for the evening or weekend, etc. People (or at least I) realize that such jobs require experiences from outside the workplace as well. Things like, oh, interaction with other people? :) Technical jobs don't require nearly as much of that. Mine requires almost none of it. The people I work with almost always prefer email, and they are very cold when you try to talk to them in person.

I realize they have their own problems, and I realize all technical jobs do not have the problems I mentioned (but I suspect they are more likely). I've heard it's difficult to find a unskilled job in the first place, for example. But it's difficult in my field, too, and here there are a lot fewer places to apply. All jobs require concentration and hard work, but I would be able to concentrate better if I could relax sometimes and take a walk in the park or something. I wish I could find the fast-forward button so I can turn it off.

I should clarify something: I am a graduate student, but I am speaking about "work." I am employed by my university, and I have responsibilities other than studying as well, so it's really not all that different. And I have spent time in industry as well, so I'm not basing my opinions solely on academia, either. This is partly what makes my very concerned about what will happen when I finish graduate school.

I am sorry for giving you so much to read.