I wouldn't instantly assume that your boyfriend is embarrassed of you. Thinking like that can put alot of stress on your relationship, as well as yourself personally, as it will eventually push your esteem downward. You never know if maybe he is embarrassed of his friends! They may bring up embarrassing stories, or maybe he just doesn't even have close friends that he can introduce you to. He may even be the type of person that is very introverted about their personal life, and wants to keep friends and his girlfriend seperated until he offically feels he is ready. I wouldn't break up with someone just because you havn't met his friends. Make sure you talk to him, before you jump to conclusions.