I too have always been scared of confrontation. I've been yelled at publicly at work by people and instead of defending myself, I often totally shocked at the events and can't believe it's happening. I replay the event over and over again in my mind to see what I could have done differently. Of course I think of all these great comebacks, but what goes does it do?
What we can remember is that if people yell or are not nice with us, if we walk away or don't match their loud voice, we become the winner in the confrontation because did not go down to their level. If we think about that, we can realize that we acted in a "classier" way than that other person.

Z