I spent the better part of my adult life thus far feeling similarly. Nothing was enjoyable the way it used to be. I used to lay in a field with my friends getting stoned and feel the sun on my face and literally have a feeling of "I LOVE MY LIFE" (and this is after I was diagnosed with "situational" depression while my Mom dying of cancer, chose to take antidepressants as a teen, and then STOPPED TAKING THEM). As I got older I started realizing on a much more analytical level how shitty my friends were, how fake everyone is, how everyone is trapped in this hamster wheel of bureaucratic bullshit, etc. I don't know when the existential dread set in, exactly, but I will tell you it was a constant for me for probably 5 years. I am 26 years old now, and I only occasionally experience moments of not so much a panic-attack as.. say.. like a wave of existential dread washing over me... One of the things I think that helped me more than anything was adopting this feral kitten, and having a feeling of responsibility and real love for something (and I am NOT a cat person, it just sort of happened). Also things like treating yourself to truly nice things you (perhaps used to) enjoy, like fancy cheese and homemade crusty bread, or a really good glass of wine or scotch, or finding a new band or album or something that makes you feel something, anything, other than miserable. I started buying fresh fruit- like berries and shit that is so expensive at the grocery store- because FUCK IT I LOVE FRUIT AND LIFE IS SHORT! I also started jogging (which I hate but it clears my mind in that I focus specifically on my hatred for jogging instead of anything/everything else) and it helps me sleep- through my entire life insomnia has been a major contributor to my depression. These are just a few things that help me to KEEP GOING.