I am very extroverted but I don't always know how to mingle with people in a larger social gathering. So I try to just jump in as much as possible. I found that I get along with someone one on one but when there is more than one person in a group, I have a harder time understanding the unwritten social rules of relationships. Believe me, I have hate them.
At work, for example, I get along with several woman there but they get together and often just leave me out. I can hear them talking and goofing off. Then as soon as I try to join it's, "We are talking about personal information, we'll talk another time."(This one always makes me cry).