Introverts just don't talk unless they have something to say. They hate small talk. Get and introvert talking about something they are interested in, and they won't shut up for days.
What they need is a reason to interact. They don't interact for the sake of interacting. If you want to talk to an introvert, just start talking. Don't worry about being polite.
Introverts want everyone to just be real and honest. Unfortunately, this is not acceptable in most settings, so introverts can feel a lot of pressure to fit in, which they find exhausting.
If you are lucky enough for an introvert to consider you a friend, you probably have a loyal ally for life. Once you have earned their respect as being a person of substance, you're in.
Introverts take in data and experiences very quickly, and as a result, don't need to be there long to "get it." They're ready to go home, recharge, and process it all. In fact, recharging is absolutely crucial for introverts.
Introverts think a lot. They daydream. They like to have problems to work on, puzzles to solve. But they can also get incredibly lonely if they don't have anyone to share their discoveries with.
Introverts think for themselves and because of that, they often challenge the norm. They don't make most decisions based upon what is popular or trendy.
It's just that their inner world is much more stimulating and rewarding to them.
Introverts typically relax at home or in nature, not in busy public places.
Introverts cannot "fix themselves" and deserve respect for their natural temperament and contributions to the human race.