Shyness is the feeling of apprehension, lack of comfort, or awkwardness especially when a person is around other people. This commonly occurs in new situations or with unfamiliar people; a shy person may simply opt to avoid these situations. Although shyness can be a characteristic of people who have low self-esteem, the primary defining characteristic of shyness is a fear of what other people will think of a person's behavior. This fear of negative reactions such as being mocked, humiliated or patronized, criticized or rejected can cause a shy person to retreat. Stronger forms of shyness can be referred to as social anxiety or social phobia.
Putting one's hand over their mouth while laughing is often seen as an example of shyness in certain cultures (first child), as is hiding behind somebody else's back (third child)
Embarrassment or awkwardness is an emotional state that is associated with mild to severe levels of discomfort, and which is usually experienced when someone commits a socially unacceptable or frowned-upon act that is witnessed by or revealed to others. Frequently grouped with shame and guilt, embarrassment is considered a "self-conscious emotion", and it can have a profoundly negative impact on a person's thoughts or behavior.
A woman covering her eyes as an expression of embarrassment
An embarrassing proposal by Antoine Watteau