1) The reality is you need to find validation and fulfilment outside of work, because in our current society you are just a drone.
2) Don't be depressed because it seems like this is how it's always been. It hasn't. Our work culture is broken. People never used to be so far removed from their work. Trying to combine work and life is a natural thing, because people used to be tied up in it. Working the land, being close to home, running a family business, belonging to a small town of people you all known, having the social safety net of many people that are close to you and your family, being an independent contributor in the town's economy, etc. etc. This is how things were a few hundred years ago. Yes, there was less high tech gadgetry. There were corrupt officials, plagues, bad people. There will always be some element of this.
I really get the sense that so much of the first world's unhappiness right now is due to compartmentalising (the containerising if you like) of our lives. The solution to burnout at work is to create greater separation between work and home. But the problem itself is that we even need to do this. People can't live to enjoy what they do any more. You need to trade the majority of your waking hours for money you need to live. And when you do live, you're dreading returning to work and feeling burnout anyway. How depressing.
This is why the working-from-home trend that I hope COVID will kick-off is going to be a good thing. While we may still be working for the same companies, having a tighter integration between work and home is actually good for our mental health. Issues will be resolved faster. Nobody wants to be constantly angry in their own home. So if you're angry all the time while WFH, maybe you'll be more likely to look elsewhere. Taking breaks from work while at home is so much more refreshing. I can't think of anything more depressing that spending my lunch break in a work cafe with people I don't want to talk to, being flooded with fluorescent light, and thinking about how the rest of my working life will be spent in places like this.