Shyness

Feeling of apprehension, discomfort or awkwardness in the presence of other people

Shyness

Shyness (also called diffidence) is a psychological trait characterized by social inhibition and apprehension in response to new social environments or perceived social judgement. It is frequently associated with social avoidance. Although shyness can be an attribute of people who have low self-esteem, the trait is often defined by a concern regarding the negative evaluation of others, such as mocking or rejection.

From Wikipedia, under CC BY-SA. More on occurri.