I know a lot of people as described in this post, but it's never been an issue for me. I'm much more concerned about earning status, then embarrassing myself. I remember when I first started BJJ I was getting crushed, but it was still fun. But once I had been doing it for a year getting submitted stung bad because I should have known better. In the end I think the advice about accepting embarrassment is still good, because if you're pushing yourself and trying to perform at a high level you will never stop failing and embarrassing yourself.