When you Sign-in to your Youtube account, to watch videos in "youtube", a view list of your watched videos appears as "recommended videos" whenever you open your "youtube-channel."
How to Delete Browsing History ?
Go to Youtube.com, login to Your "Youtube Account" then click on "My videos"
Then Click on History,
Then Click on " Clear all viewing history".
That's it, you are done clearing your browsing History of your youtbe video's.