Social Anxiety Disorder
The fear of interaction with other people that brings on self-consciousness, feelings of being negatively judged and evaluated, and, as a result, leads to avoidance are the recognized as Social Anxiety. It is the fear of being judged and evaluated negatively by other people, leading to feelings of inadequacy, inferiority, embarrassment, humiliation, and depression.
If a person usually becomes (irrationally) anxious in social situations, but seems better when they are alone, then "social anxiety" may be the problem.
According to the epidemiological studies, in the USA, have recently pegged social anxiety disorder as the third largest psychological disorder in the country, after depression and alcoholism. It is estimated that about 7% of the population suffers from some form of social anxiety at the present time. The lifetime prevalence rate for developing social anxiety disorder is 13-14%.