A muscle doesn't grow stronger with atrophy... likewise, the mind doesn't grow stronger without challenge.
It's like trying to use a tool all the time expecting it to get better instead of wearing itself out. That's not how this works. No matter how good you get at human interaction it won't change the fact that it will drain you, if you're introverted.
The more human interaction I can avoid, the better, so I'm recharged when I have to interact with people.