Brianna is a 20-year-old who lives in a small town. she has always been extremely shy, but lately she has been feeling intensely afraid that others are scrutinizing her. she avoids speaking in class, she no longer goes to parties, and she starts trembling whenever she is in a public place. brianna seems to be suffering from a:

I believe the answer is: a social anxiety disorder
a social anxiety disorder refers to a psychological condition that make certain people fear the situations that require them to interact with other people.
On average, people develop a social anxiety disorder when they have obsessive thought of being negatively judged by other people.