Of course T knows your anger is not about her. That's probably what makes it safest to express it in front of her. If you got angry like that to anyone else, they'd knock you out probably. Sometimes if you've never really explored an exotion, the best time to do it is in therapy where T can be there and help you process things over time. By the end of it, you'll be more comfortable with anger and hopefully learn how to express it in healither ways. Still a hard and confusing process to go through but I wish you the best!!!