Shyness is a feeling of fear or discomfort caused by other people, especially in new situations or among strangers. Shyness is an unpleasant feeling of self-consciousness, a fear of what other people are thinking.
Depression is classified as a mood disorder. It may be described as feelings of sadness, loss, or anger that interfere with a person's everyday activities. It is estimated that depression affects 1 in 20 Americans.