The question of our reactions is the key to it. If we didn't react the way we do then our anxiety wouldn't be a problem.
The key for me has been to see that my anxiety has been learnt and only persists because it is the only option I have. With other options come other choices about how to do things in social situations, which you can't have if things are always the same.
Of course I didn't choose the anxiety deliberately but now I have abetter way of dealing with people and things and if I'm anxious now I see I do choose it. Initially I went for lessons because of my posture but it's not about posture at all even though everything you read says that it is (and sometimes doesn't make sense I agree).
What's good is that it isn't a therapy and helps lots of people with lots of problems which i liked, not some special thing for my special problem.