I saw the episode "Tapestry" as a young kid and as someone with severe anxiety, it taught me that it is okay to make mistakes. That really put a new perspective on my life because I was terrified of making mistakes. I thought that mistakes made me a lesser person. To date still my favorite Star Trek episode.At least there's a positive take on Tapestry. I saw it while in between jobs, and let's just say it would've given me an existential crisis at any other time lol.