Why are introverts the quiet ones in social gatherings?

Finch Cafe, Vancouver

One big difference I’ve noticed between introverted and extroverted people is that extroverted people tend to share their experiences while introverts would rather discuss a topic or a concept. That makes sense; when someone doesn’t get out much to have experiences and invests a lot in activities that include reading, writing, and creating, then they don’t have many experiences to share and end up being quiet all the time in social gatherings. What do you think?