The OP just needs to roll his sleeves up and sink his teeth into some strenuous labor. There's nothing like hard work to get the endorphins moving and to stop all of that pretentious psychoanalysis from bouncing around your brain. I don't think I've ever met anyone who was both introspective and happy. ZeldaAdmirer you remind me a little of me back when I had a spell of unemployment in my early 20's. I spent much of the day stoned out of my mind thinking endless thoughts about myself and my place in the universe. What was my purpose? What is happiness? What is pleasure? What is my destiny? And I ended up deeply unhappy, convinced that I was incapable of feeling happiness or relating normally to people. When you're in that pretentious state of mind you're guaranteed not to enjoy life. You can't take the rough with the smooth. Every setback turns into a tragedy of almost biblical proportions. You're looking for some kind of spiritual completeness which doesn't exist and because you can't attain it, you're in a perpetual gloom. And then you start thinking that other people are enjoying this spiritual completeness without you (they're not) and the envy kicks in. It's horrible. And in all that time, I had people older and wiser than me telling me that I just needed to STFU and get on with life without thinking about it. Oh how clueless they seemed! They didn't understand! They're obviously not as sensitive and artistic as me! BOO....FREAKIN'....HOO. That's what it all boils down to. Boo freakin' hoo. They were right, and I was wrong.
I know women who have spent their whole lives in that introspective state, their noses forever in some BS "self help" book or other, and they will reach their 60's and 70's without ever having enjoyed life. Alright so there may be one or two good books. But the vast majority are nothing more than the psychological equivalent of dietary fads that will never, ever incorporate themselves into the fabric of your life or make you feel better. And neither will your own self-analysis.
Just accept that it's not going to get you anywhere, stop thinking about it and throw yourself into some hard work, doesn't have to be physical necessarily. I don't know if you're currently working or unemployed but it sounds like you have a lot of time on your hands to think. And your thoughts are torturing you. What I found was that when I shifted my arse in gear and lost myself in hard work, the BS thoughts took a back seat. They were still there, but I just didn't have time to indulge them. After a while they just gave up and took off to bother some other poor sap, and all of a sudden I found I was enjoying life again, just like I did when I was a kid and all of that pretentious hogwash hadn't infected my brain. Nowadays I don't look for any higher meaning of life and I don't really care. That's not to say I'm not curious about "all that," but now it's just an interesting subject to be entertained every now and then along with all of the other interesting subjects which vie for my attention.
I hate to come across as unsympathetic, but you REALLY need to force yourself to occupy your mind with non-destructive, non-pretentious thoughts. They're ultimately pointless.