I live a somewhat similar lifestyle( although not as extreme as gp ), I have 2 cats which that I leave with my girlfriend when I fly out.
>I envy you that you can do it.
I sometimes regret not having a structured lifestyle and warmth of family. I am envious of my friends with kids who are going with the flow of life and are not living in existential dread. It's a classic human dilemma of freedom vs security.