1) They actually enjoy everyday life. I find this unbelievable. What is enjoyable about emptying bins, commutes to work, washing dishes, dealing with people in HR, etc. Most people don't enjoy their job either so I find this option implausible.
Meaning in life comes from within. So yes, if you are framing things in a positive way, it is perfectly possible to empty a bin with pleasure, to feel grateful for having had all the food that went into the bin, for the people who will come and empty it, for your physical ability to do a useful task, for the stroll to the bin, etc etc. Or to just acknowledge it's a mundane task and do it without it weighing one down, at least.
I don't mean that if you hate your job you shouldn't take steps to change it, but generally our experiences are good or bad (or neutral) because of the stories we're telling ourselves.
I would suggest:
GP to discuss depression and check for any underlying causes.
Exercise.
Check your diet, nutrition, water intake, sunlight and fresh air, etc.
Counselling/therapy
Philosophy - maybe try Stoicism, Buddhism, Christianity - go to the library and root about in the self help section. Try a few things. Play around. See what helps.
Martha Beck wrote an interesting book called 'The Joy Diet' (she means 'diet' in the sense of a regime, not an eating diet).
Maybe you need to make some actual changes in your life, maybe you need to change your perspective. Keep trying things out, see what helps, try a combination of things. What would you tell your daughter if she came to you and said the same thing? I think it sounds like you have some pain that you are avoid'ng looking directly at and depression can be a reaction to that - its a sign you need to take action.
You have one precious life, OP, be kind to yourself and honour it.