I lead a solitary life and I think (though I could be fooling myself) it’s by choice. 😉 I barely even think about that any more. I need solitude. A lot of it.
Being an introvert generally means that too much contact with people depletes my energy. I get very tired. Hiking and hanging around with others at the same time doesn’t have that effect, but even after the most fun times of conversation, food, conviviality and I need solitude.
There’s the misapprehension that introverts are anti-social, socially awkward, or shy. None of those are necessarily true. If you catch them at a time when they are recharging their social batteries, yes, they might appear anti-social, awkward or shy even though they might actually be friendly, gracious and interested in others.
I have a few friends who are extroverts. They “get” me because they are aware people. Most of my friends, however, are introverts. When we get together to do something, we have a lot of fun for a couple of hours then we “retire” to our caves for an undetermined length of time. It’s pretty amusing.
Basically, if you cannot live with (and by) yourself, you can’t live with others, either. Why? Think about it. No matter where you go, there you are.
Here is kind of a good article on what it means to be introverted.