You will never truly understand the struggles of another person. Remember to realize how hard your own struggles are for you. The other guy feels the same way. We are all trying to make our way in this world so make it easy on everyone and don't judge.
True introversion - not being overly shy, but needing to be alone to get energy, and thinking things through (usually a lot) before actually being willing to say anything. That's why what I think is much more than what I actually say.