extravert
An Extravert is someone who does not get nervous or shy when faced with talking to strangers. They are often easy going and are usually good speakers. 

The Extravert in a group would be the first person to introduce himself to a group of strangers.
We need an Extravert to get this group of people talking..

See dude, if you were an Extravert you wouldn't be so nervous about meeting some new chicks!