I can't do it anymore

If you really like to play chess, but don't like to lose, then play for fun! Acknowledge that you aren't Magnus Carlsen, and just play casually. I promise you that you will start to see improvement!

Gary Kasparov was 5-0 down against Karpov.
did he say “i am a failure” ?
well i am not sure but he refused to lose again in that match.