Communication apprehension is often described as

Communication apprehension is most often described as a form of social anxiety about interacting or speaking.

It is the fear or discomfort a person feels when facing real or expected communication with others.

Social relativity refers to judging things against social standards and does not name this fear.

A psycho-social barrier is a broader obstacle category and is not the specific label given to apprehension.

Social ambiguity means unclear social situations, which is different from the anxious dread of communicating.

The anxious, avoidance-linked feeling around communication is what marks it as social anxiety.