OnlyMe, this is just my two cents, but it is possible that you do not have your therapist fooled nearly as much as you think you do. They deal with an awful lot of troubled souls, and they get pretty good at seeing beneath appearances.

If you T asks a question that you do not want to deal with, I doubt that s/he will push you where you don't want to go. Sometimes they have role-playing and other techniques to help free one up.

If you truly believe that you are deliberately hiding things you need to talk about, perhaps, as suggested, you ought to make a little effort. Your T is there to keep you safe, not to push you beyond what you can handle. On the other hand, if being your T and even laughing a little at yourself is comfortable, let yourself off the hook. I'm betting your T knows that you are not there to shoot the breeze and is letting you set your own pace. If you did not need to be there, you would not go.

Take care of yourself.