More often than not, this is not "fear", but an excessively overestimated significance of how the interlocutor will perceive you, the fear of appearing weak, stupid, uninteresting, etc. The reasons are criticism and suppression in childhood. Work - cognitive and systemic behavioral therapy for a month or more.
The specialist has the knowledge to get what he wants, but the request for change must come from the client (patient). Only with goodwill can the client reveal himself and allow the specialist to perform therapy. If the client wants to change, then the specialist will identify all obstructing beliefs that act as barriers and filters of perception. It may also be a matter of disapproving fear.
Fear of communication arises from low self-esteem, social maladjustment and self-pity. To eliminate fears of communication, it is necessary to independently (through training in self-hypnosis and self-regulation) or through a hypnologist to increase self-esteem, do self-reinforcement, form new thinking patterns and skills of self-realization in society