Sunlight. I'm not an albino or anything, but I've always hated it and having it cast upon even the slightest portion of my body has always made me feel slightly ill/uncomfortable. It's bright, it's annoying, it's shit. I have extremely thick curtains in my room which block out 99% of that accursed light beaming from the sun, which, all in all, couldn't make me any happier. I've only been out in broad daylight twice in two years, (both of which amounted to less than 10 minutes outside of a vehicle) and twice was more than enough.
Other than that, practically all the maintenance required for the human body to function has, a matter of course, always bothered me greatly (eating, drinking, defecating, sleeping, etc.) Not to then mention all the upkeep with personal hygiene like bathing/showering, brushing one's teeth, shaving, combing/trimming one's hair (etc.) Then there's all the more direct needs when your body starts to malfunction in some way like needing to take an aspirin because of a headache, being stricken with a mild infection of some kind, getting an irritating rash or mark that won't go away, other aches & pains that are legion, some brief some not so brief (etc.) Take my fucking brain out of this pitiful vessel of flesh & bone and put me in a nice shiny body of chrome steel (T-800 style), free from having to service the endless needs of this weak bag of meat any longer. Or just put a bullet through it. That works too, if not better.