You can see your YouTube comment history at any time you want and here is how you can do it on PC:
Go to this URL. Sign in if not already.
Now, you can see all your YouTube comments.
If you click on any link above the comment, it will take you to the YouTube video in which you have posted that comment.
When you hover your mouse over a comment, you can see Overflow Menu (three vertical dots). Click on it, and you can see two options - Edit and Delete.
"Edit" option is used to edit a YouTube comment. Click on "Edit" option, and it will take you to the video where you posted that comment.
Scroll down, and you can see your comment which is ready to edit.
Click on the comment, and you can see the cursor now. Edit the comment as per your liking and then click on "Save."
Keep in mind that you can see (edited) label beside every edited comment.
"Delete" option is used to delete a comment.
Also, note that the YouTube app does not have the option to view comment history.
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How to See Your YouTube Comment History