Question about Primal Hunter

So I'm about 10 chapters in to the first book and I can't help but wonder... Is Jake a psychopath? Not necessarily as a negative connotation, but he's giving me psychopath vibes. Spoilers below as to why I lean that direction.

So within 24 hours of being abducted without any warning, he watches a co worker lose a leg as he enters a near death situation. He basically just shrugs and says "not my fault, I climbed a tree. Too slow lady that's what happens." Not only is he uncovered By a terrible injury, he just doesn't seem to care at all at her severe pain.

Then the night raid happens, sure he was defending himself, but brutally killing 3 of your fellow man when earlier that morning you were simply going into a desk job should register somewhere on the emotional scale aside from "that was fun." I mean, stabbing a guy in the eye with an arrow, and then stabbing their friend 9+ times and just smiling over the whole thing makes me worried about this guy.

It's a highly recommended series so I want to stick with it. But the main character just feels like Dexter who didn't start murdering people until now. Even the way he talks about Caroline "He liked her, well maybe, probably not actually she was just a female at his age range and in proximity to him." He just checks a lot of psychopath boxes, again, it isnt necessarily a bad thing, but I'm just wondering since it's hard to relate to the guy at the moment. I hear so many good things about the books, but I'm kind of off put by the guys lack of empathy and emotions in general so far.