Yes. You have a point and that is why I also pointed out that when mixed in with low self esteem, poor self-confidence, constant discouragement and a history of half-hearted attempts to fit in that ended in failure that it can make the introverted person even more quiet than normal thus leading further to the likelihood of going through life as a loner.
Some introverts prefer being alone but as the old saying goes
"Everybody needs somebody" so, I was just trying to give extremely introverted and lonely people a piece of advice that has helped me.