I'm starting to come to the conclusion that I'm playing as a space dwarf. He's super short, just barely as tall as planet shrubbery, and loves to mine. In fact, that's what he's the best at, mining everything. He's also a pretty good tinkerer, so I haven't ruled out that I might actually be roleplaying a traveling space gnome.
After a couple of hours of playing last night I've also learned that my space gnome/dwarf never took any classes in land navigation, and has just the most rudimentary understanding of celestial navigation. It certainly makes traversing planets challenging without any sense of cartography or map navigation. But he's damn good at mining the shit out of stuff.
I still don't know why planet sentinels hate him so much. Space gnome prejudice? I haven't seen any signs, laws or rules that prohibit the melting down of planetary resources.