My aunt is a nurse, and I've heard some of her wonderful stories about having to take care of people in that sort of way, so... I can honestly say that being a caretaker is out of the question for me. O_o Though, I definitely wouldn't mind taking care of a relative or friend if they needed it, I just wouldn't want to do it if you meant for a job or something, lol.
I guess that if I had to choose I'd pick burger flipper or janitorial service. Though, I really wouldn't want to do either, not even for my first job... bleh. All of that stuff is too nasty to work with. And plus, the orcas are calling me!!!!!!! *runs off*