This can be so tremendously hard for some people to understand (I've encountered it countless times over the course of my life). My being quiet does not mean I have anything to hide. I just don't have anything I want to, or feel like showing you.
I don't participate (if at all) during group conversations. I love listening to others talk and I'll chime in if it's something I'm passionate about or knowledgeable about. Otherwise, I'd prefer to sit back and take it in. completely me.
This is SO TRUE: The funny thing about introverts is once they feel comfortable with you, they can be the funniest, most enjoyable people to be around. it's like a secret they feel comfortable sharing with you. Except the secret is their personality.