I just look at my calendar and go to work when it tells me to.
I feel guilty about all those times I told cashiers to have a nice weekend, because for some of them (like me working seven days in a row right now) the week never ends.
I don’t hate this; it’s just different from going to work M-F, 8 to 5 with an hour lunch. My life has more flexibility for doctor’s appointments, calling businesses, etc. And, although the pay is very low, at least I’m making some money to reduce the bleeding from my savings until I can complete my phlebotomy course and start some real bleeding!