YouTube comment sections, notorious for some of the most foul language and abuse on the Internet, are nevertheless a useful way to connect with a content provider. While YouTube makes it easy for you to find comments that others have made on your own videos, YouTube no longer collects your own comments in one place for you, so finding the comments you've posted can be a bit tricky, but it is not impossible.
Step 1: Go to your History
After you've signed into YouTube, click on History. Once on your History page, you can navigate to either your Watch history or your Search history.
Step 2: Go Through your Watch history
Your YouTube Watch history is organized chronologically starting from the most recent post you have watched. To find your comments, scroll down through your history until you find the post with the comments you want.
YouTube now has the feature of letting you share any comment you make on YouTube simultaneously on your Google+ page. By clicking on Also share on Google+ when you comment, you can easily find your comment history on your Google+ page.
The third party service tubecomments.com enables you to search for comments by YouTube username.