INTP with pretty strong introversion. My immediate reaction was that I couldn't be an introvert because I was so outgoing and social. Then I learned that introversion was more about how you get energy and that I was likely drained (rather than energized) by social interaction. And it totally clicked why living with three girls was exhausting me. After that year I mainly lived alone (until I got married) and absolutely loved it.
My husband Blake and I are both energized by alone time, which is definitely challenging now that we have children. As I've reflected on parenting choices over the last two and a half years, I've thought a lot about what I want to teach my children. One thing I emphasized a lot with Jackson was learning to enjoy his own company. While I could care less if he's an introvert (and actually think life is easier in some ways an extrovert), I want him to be able to entertain himself and not need constant companionship--plus I knew we'd have another child, and he would need to be able to function without my constant attention. And wow, whether it's what I've emphasized, genetic, or just by chance, Jackson loves being alone. After two hours at the Discovery Museum yesterday, Jackson played outside by himself for almost 30 minutes--mainly sitting in a chair and surveying our yard. He loves to "read" alone and work on his projects (moving dirt, cutting the grass, organizing various things, etc.). This picture is what I saw when I looked out the window yesterday; Jackson just sitting in a chair.
With a second child, it's been much more challenging to give her opportunities to be alone. I've started putting her in her crib with toys for 5-15 minutes stretches, but her brother usually ends up wanting to be with her or giving her toys and interacting with her. When her brother isn't home she'll play alone for a few minutes but is definitely accustomed to having him around to help entertain her. Now that she's walking 99% of the time she's seeming more independent and exploring more on her own. Of course, different personalities are what makes the world go round, and we love seeing their individual personalities emerge.
p.s. I'm thankful for our new family routine of taking walks in the morning.