I had a pretty intense acid trip once and came to the conclusion that nothing matters, there is no meaning to life, there is only an illusion of free will, and most likely our existence and personal experiences in life will be completely forgotten within 3 generations (almost like we never existed to begin with). I was super duper depressed after that for several months.
It eventually gave me a different outlook on life though. If it’s only temporary and there is no meaning, I can create my own meaning and enjoyment in life. Live in the moment, do what you want, and create as much meaning and enjoyment for yourself as you can while you have the opportunity. Don’t worry about what others might think because eventually their existence is going to be forgotten as well.
The act of dying might suck, but being dead and not existing seems very serene. Sometimes things just sort of end.