Ok, I was you, antinatalist, the lot. So I'm going to try to help you too. This advice won't help everyone because I am very lucky really but anyway ...
The only way I got out of this was to change my life. I moved abroad so I could live in a warmer climate with land, so that I didn't have to hear neighbours all the time and I could "reset" my brain back from being basically overstimulated all the time.
I consider myself a good person but society had worn me down and I was bitter and like you thought that deep, deep down life was just sh*t.
Well when I finally got some peace and quiet, I realised that I actually like people and could appreciate them if I could come home and reboot afterwards.
It's changed me so much that I've actually had a baby and I honestly love my life now.
I know not everyone can just "change their life" but I wanted to show you that it can be done and that this type of thinking, at least for me, was because I was totally fried from everyone being there, making noise, all the time!
Hope this helps in some way.