I made a comment on YouTube and want to see if someone replied to it.
If you simply go to the site https://www.youtube.com/feed/history/comment_history (assuming you are currently logged on to the account from which the comment was made) you can see all comments that you have made.
From that area, you may click on any of the highlighted (and thus, linked) words, which will be linked according to the content to which they lead.
(Example: Click the linked word "Comment" to go directly to the comment you posted - Click the linked text displaying the "Title of The Video" to go to the page the video is located on, but not necessarily the comment you yourself made.)
Also, to see all your youtube comments, you can use tubecomments.com. You type in your username and it shows your whole comment history.
Fren you can check all off your comments on the Comment history: https://www.youtube.com/feed/history/comment_history