You can edit or delete your comments and replies directly on YouTube. If you delete comments, it may take a few hours before they’re fully removed: https://myactivity.google.com/page?hl=en&page=youtube_comments
This is the history of you YouTube comments and you can directly jump to it from this central place.
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I should clarify, this is an official page from Google (as seen in the domain link). This is for people with a YouTube account, commenting under videos in YouTube. I’m simply pointing to this place, because many don’t know about it. Hopefully this post belongs to this community.
Deleting my cringe comments from 2012 was really cathartic, thanks 😂
Thanks. I had a blast reading my old comments :p