Sophie is 23 years old and sees you today with her sister. Her sister is concerned about her lack of social contact and that she predominantly only sees her immediate family who live in the same household. Sophie reluctantly admits she fears that she may say something embarrassing in conversation with other people. This has happened since she was a teenager. She gets very upset in situations she has to leave the house for a food shop for instance when her mother is working night shifts and admits she sometimes has a glass of wine before doing this.
She denies being low in mood and sleep and appetite are normal.
What is the most likely diagnosis?