Therapy makes me feel rude and selfish.

I talk about myself 100% of the time, say whatever I want, and even express negative feelings towards T.
In real life I listen more than talk, and rarely directly express negative feelings.
For example, I told T I was mad at her for being late. T said she was glad to hear my real feelings. She didn't seem upset, but I wondered if she was just acting professional. What if she secretly felt

accused and blamed?
In real life I would have been more empathetic of others' points of view, and more tactful and considerate in the way I expressed negative feelings.