When we talk about jobs that aren't for everyone, the job of mercenary comes to mind. This is definitely not the job for everyone in terms of both skill set and in terms of raw nerve. A mercenary can be hired for either combat or for protection. They are usually ex-military since the job requires skills only gained and tested on the real battlefield. As you can see by all of those details, this isn't a job that you can simply fall into. It might be considered a loser job simply because it truly is for those who can't do anything else.
It's tough to say what will happen on a mercenary job, but you may find yourself in the position of just being there to keep order. That isn't so bad, but your life will always be at risk with a job like this. That's of course why it will pay very well.