Shy around boyfriends friends?

i'm not normally a quiet person at all but when im with my boyfriend and we go hang around with his friends i just feel really awkward because like they're all talking about their lives and theres just nothing for me to say usually haha because i dont even know them really apart from sitting there awkwardly with them a few times! how can i be more confident around them and what can i say to them to make conversation that im included in?! usually they all talk and im just sat there!