I'm closer to the middle between the two than a lot of people, but I'm definitely an introvert. Same thing - I recharge with alone time.
I love my friends, seeing them, and if I have energy built up can even greatly enjoy being out in a crowd. But home alone is how I recharge. It's hard to explain what makes them that way, but the relationships I've had which have gone anywhere were with men who could be present and I could still recharge my energy levels, instead of their presence wearing me out.
The pews never miss a sermon but that doesn't get them one step closer to Heaven.
But at least the pews never attend yoga!