How do introverts handle extroverts?

Having been introverted in social situations for a period in my younger days, I can relate to how you feel. I can tell you that it is OK to be that way and it is sometimes easier in more intimate settings to allow your feelings to be expressed. It is a function of your personality more than anything else. Being serious minded and aware is not a bad thing, but can be socially restrictive. Try to lighten up just a little bit and engage in conversations. Try to find people who have similar interestsa nd get comfortable interjecting your opinions on subjects that you know about. Practice the art of conversing about these things and transpose the same style into other subjects as you get more comfortable in crowds.