It's mind-boggling to me how most people live life without being miserable

I keep trying to sleep but I can't because I have insomnia. I have to wake up early, so I walk around like a zombie all day because society decided that life starts at 8 AM. Job is decent enough, people are nice, low preasure. Still, 8 hour workday feels too long, and when I get back home I have no energy left. I have no energy to socialize, exercise or even cook a meal. I end up ordering something. I usually skip on chores unless the place has become too dirty. I am on a perpetual burnout despite not doing anything except for my job. I am gaining weight, my skin is breaking out and I have no money left due to ordering food everyday. How do people go to work, do their chores, make time for their family and socialize with their friends? I am supposed to be one of the lucky ones too. I have a stress-free office job, no financial debt and can afford my own place. If this is better than average, then how come everyone else isn't miserable like I am? Or is it just me who is crushed under the bare minimum workload required just to survive? It's already 11 PM somehow. I go to bed. I keep trying to sleep but I can't.