Thank you all for your replies.
When I realize that I got myself into the "excessively mirroring" mode with another person, and it feels like suffocating with small questions and hyper-sensibility to every little thing (facial expression, sound, tone of laughter, where the person is looking, desperately trying to keep the person in the conversation...), I manage to SHUT my Ego DOWN; somehow, I manage just to STOP that constant hyper-vigilance and let the other person take spontaneity, I give myself to the art of being vulnerable and let myself feel this fear of abandonment and loose of control over the communication.

Still I wonder, how other people feel their own self-awareness and self-value without the need of mirroring. I admire to that.