Some people are really talkative, they just can't shut their mouth for a second, on the other hand some people are not the talkative one, some just use to listen what others are saying, some neither talks nor listens. Accordingly we categories these people, sometimes we think the people who don't talk much might have ego, sometimes this could be true but there is possibility such a people are unable to express. We can call such people introvert, they believe in keeping things inside instead of saying out loud.

I guess introverts have lonely mind, lonely mind is something that is not truly discovered. A lonely mind has ability to control their feelings most of the times. The people with lonely mind do not share their thoughts or feeling with any random person, they only shares with few, with whom they feel  some kind of connection. I guess such a people are always in search of connection, that connects their mind with others. 

We can not make a lonely mind person to share their true feeling with others that easy. They are kind of tough shell to crack, but if once their vibe matches with someone they might feel free to open up. If anyone out their having someone in their life with such a lonely mind, and if they vibes with you, don't ever break their trust. They are the one who don't trust any random person that easy. It is not like they talk to you just to pass their time, if they are talking to you that means they just want you to know whatever it is. Some times they are really good at keeping secrets of their own and others too.

So many time people misunderstands their behaviour, people think introvert people have ego, that's why they don't talk to everyone, It is not like that. They have bonding issues, they might feel like if they talk to someone, their trust is going to break somehow. If you are prior to someone who has lonely mind, I believe they must be ready to do everything they can, for you. All they want is a bond with trust.

Most of the time such a introvert people end up being alone, and it is because of their reticent nature. It's not anyones fault it's just the way things happen. Introvert can be good listeners, as they don't talk much the listens most of the time, so if you have someone like this in your life you are lucky to have them. Don't lose them.