I’m 26. After taking high school biology, chemistry and physics and history, I was sure that some kind of accident or even just my health would have ended me soon. Evolution isn’t conscious. It just puts a ratchet on death. The ones that don’t die and get to reproduce are the lucky ones. And I’m not convinced I have any genes worth spreading around. And I seem to rely on luck for the not dying part anyway.
Back then I also had issues with depression and anxiety, so that didn’t help much in shaping my sense of self during those formative years. Not for lack of trying though, from the parents and their fundamentalist religion that said I had to obey a psychotic shit throwing man-child in the sky.