What does it honestly mean to be an introvert?

Does it mean that someone is depressed or anti-social? Or maybe it means that they are stuck-up and rude?

Recently I was asked why I had chosen to become an introvert. Wait. Go back and reread that part again. Why had I “chosen” to become an introvert? Let me take this moment to explain something to anyone who may be reading this. As an introvert, I often enjoy spending my time alone, whether it be reading books or just simply relaxing on the couch. I love to take long walks by myself in order to get away from the hustle and bustle of everyday life. Writing is the most efficient way for me to communicate my thoughts and feelings because I have a hard time expressing myself verbally without talking too fast, stuttering, or stumbling over my words.

Now…