Most of my friends are extroverts.
I am  definitely an introvert, not outgoing at all. 
I think I am probably in between.
So you don't like being alone but are good in crowds? Or how do you characterize your introversion/extroversion?
It depends on the situation. I am more comfortable in smaller groups of close friends.
three-factor model, Raymond Cattell's 16 personality factors, the Minnesota Multiphasic Personality Inventory, and the Myers–Briggs Type Indicator.
Extraversion and introversion are typically viewed as a single continuum, so to be high in one necessitates being low in the other. Carl Jung and the developers of the Myers–Briggs Type Indicator provide a different perspective and suggest that everyone has both an extraversion side and an introverted side, with one being more dominant than the other. Rather than focusing on interpersonal behavior, however, Jung
are growing uneasy. What lands you have, you may retain forever; but we shall sell no more. You think, perhaps, that I speak in passion; but my heart is good towards you. I speak like one of your own children. I am an Indian, a red-skin, and live by hunting and fishing, but my country is already too small; and I do not know how to bring up my children, if I give it all away. We sold you a fine tract of