Let me first start out by defining my own introversion. This will allow other introverts to see what ways they are similar to me and what ways they are different. This will also help others to have a picture of the introvert doing the writing.
First of all, being an introvert does not mean that I am socially backwards, short on friends, or envious of all the extroverts I know. Second, I claim to be an introvert based on my own habits and observations, but also based on more objective measures including personality tests such as Myers-Briggs.
I am such a complete introvert that I thought my wife was an extrovert. She informed me that she is also an introvert (based on her own observations and Myers-Briggs). To top that off though, she had no illusions that I was an extrovert.
As an introvert, I seek to stay out of the noise and confusion that is so prevalent in the world. I prefer smaller interactions which are not based on formalism or social convention. I seek autonomy.