About introverts

http://www.lifehack.org/articles/communication/15-things-that-introverts-would-never-tell-you.html

Find most of the things true.
Go and read about it!

We are not shy, rude or uptight.

At first, we may seem that way. Get to know us, and we can actually make you laugh, and hold a conversation that lasts more than 15 minutes. The thing is, we don’t share this with everyone. Being “social” or “sociable” is an option, not a way of being. We can’t fake happy or excited really well, and we show what we think on our face, not as much in our words.

This is especially true for people who I've just met.
It just takes time for me to get comfortable with you.
Days, weeks or even months.