Aye, being called on sucks, but I don't think participating in class discussion is a waste of time whatsoever. And it seems pretty ridiculous that one would go through what we all undoubtedly had to go through to get into law school and then put forth such an enormous effort to not get called on.
Just do the reading...spend a little time preparing for class...if you get called on, it's more of a learning experience for you as a student than it is anything else. Nobody's ever going to be 100% right all of the time. The Socratic method is all about making you realize that you don't understand. The fun is in the challenge.
To sit in silence while you're being called on is much more idiotic than getting a wrong answer in front of the class. People won't remember that "Ms. X got the answer to International Shoe wrong in Civ Pro," but they will remember that "Ms. X was too big of a p*ssy to answer when she was being called on."