Hey guys
I got a problem... When I'm talking to someone, boy or girl I'm quite interesting and funny, but the problem is that if another person joins the conversation we are having I freeze up and can't seem to say anything and I lose my ability to say interesting stuff and say something funny, instead I just give short and boring answers when they ask me something... As soon as one of the persons leaves us and we are two again I'm back to myself again

This doesn't just happen with a person I just met, but also with my friends, co-workers and even family, but luckily not as much as when it's with someone new... This sucks, because I can't introduce the person I'm getting to know to my friends without becoming quiet and having difficulties opening 2-sets(and up) and more... Any of you got any advise, maybe had the same problem or can refer me to another post, site, book or the like?
Thx