I don't mind the lack of people, because I live like a hermit anyway right here on earth, shunning just about all social interactions (well, ok, I do surf HN now and then, but I have also gone many days without it).
I am what people call a loner.
Books and writing are my only, and preferred, companions.
I don't get bored sitting and working from home all day.
I work for clients only because I need money to survive on Earth; I suspect that's not so much of a problem on Mars and I can spend all my time on my own interests.
I don't feel the need to talk or call anybody.
I don't see - or even have - TV.
I do need the Internet often for research, but an offline dump is fine.
I can cook.
I am very fit. I work out and exercise, without going to a gym.
I enjoy hiking by myself in remote areas.
I can live without love. I don't want a wife or children. I've been in love in the past, but I realized it's just not for me. It did not in any way add to my happiness, though the people I loved were good loving people themselves. I'm almost middle aged, so I've already proved that I can live happily without relationships.
I have good programming, hardware, electronics and mechanical chops, and a hardcore DIY attitude. I'm comfortable with experimentation, physics and chemistry.
Somebody with my psychology and skills would probably be quite useful for something like building and maintaining a space station for years on end.
What I don't know is whether space agencies consider somebody with my personality as a misfit.I'm indeed a misfit, but it's only because I'm stuck in earth society, while I actually prefer not to be in society at all.
Not everything gets done better through teamwork, as I discovered often when I was a salaried employee working in teams.
But do space agencies realize it, or do they put ability to work in a team above all else? I don't know, but hopefully they keep an open mind.