To the eyes of many people especially extroverts, spending time alone is the last thing they would ever do. It's equal to embracing boredom.
But from your perspective, it comes with lots of benefits; building a better version of yourself, learning more about other cultures and exploring the world.
And you are absolutely right about that. Extroverts find more comfort in the midst of others, making it quite hard for them to discover some unique qualities about themselves.