The defining feature of introversion is where you find your energy; introverts, even though we may enjoy social interaction, even though we may really like people and be socially confident and skilled, lose energy in the outside world. We retreat into solitude in order to be restored.
But as I have continued to learn more about introversion, I have also come to see that there is a motivation factor for many of us. Introverts have rich inner lives and we can spend hours in our worlds of impressions, thoughts, reflections, and in the other dimensions of our inner life. From a neurological point of view, introverts have more brain activity and brain blood flow than extroverts, and we have less tolerance for the dopamine that is released from social interactions and activity. So in many cases it actually may be more pleasurable - in terms of the good feelings released in the brain - for us to be alone or at home than it is for us to be at a party or a church activity. In other words, we are more motivated to be alone than to be in a crowd. It's not that we don't like people or are anti-social or standoffish, it's that it actually feels better for us to be alone sometimes. Reading a book on a Friday night may feel better than a night out with friends, especially when we have spent the week in a socially charged atmosphere at work. In that case, it's not that we are choosing out of something, it's that we are choosing, joyfully and purposely, another activity.
Often, in Christian circles, we idealize those people that have a "passion" for community. Those people who constantly want to be around other people and who love organizing and mobilizing social events are often considered those people who have the most "love" for people, and by derivation, God. And, let's be clear, those people are absolutely indispensable for the formation of relationships in a community. Those churches that don't have those people suffer because of it. At the same time, let's also acknowledge that there is more than "love for people" that is happening here. For those social galvanizers, it feels good to be around people and to see people connect with one another. They are thriving on the dopamine that is released in their brain from those experiences. And that's how God intended it for them.
Love for God's people does not have to look for everyone like an overt, uncontainable passion for being with others. Love, as we know from the scriptures, is self-sacrificial, in which we lay down our rights and place the good of others ahead of our own. Thus, it can be a great display of love for those of us who relish our inner worlds, to lay those things down sometimes and be present with others, when we might otherwise prefer to be alone.