I've never attempted a commitment contract but I don't really care for them in principle. I don't really want to find a way to force myself to do things that I don't want to do. What I really want much more than that is to figure out how to become comfortable doing the things that I'm not comfortable doing.

To take your example, if you are uncomfortable socially it is because you have an underlying belief that these social situations could be very harmful or painful for you. That belief is most likely due to stuff that really did happen to you. You probably were rejected in your past and it was painful. I think the answer is not to find a way to force yourself to interact despite the fear but rather to find a way to reassure yourself so that you can interact without forcing yourself through fear. To add one more thing, I don't think it should be anyone's goal to be impervious to the pain of rejection. Rather I think its better to aspire to be someone who is confident that they can bear rejection and bounce back from it and learn from it. It is supposed to be painful but it should not be so painful that you become paralyzed with fear forever more. I have much more to say about it but this is a pretty good summary of my feelings on the matter.