I also constantly give feedback on the product, good feedback, bad feedback, usability tips, bugs, etc. It's typical for an SME to come to a meeting unprepared, and if that's the case, I give them a list of questions and tell them when I'll call them to follow up. Give them the impression that you're serious. Since I design websites, most of this doesn't apply. The client is ultimately responsible for the content of the site.
Some people enjoy being alone.
I am an introvert, and I get a lot of energy from going internal and writing. I'd like to make one additional comment for those who are familiar with the Myers-Briggs type indicator. Working at home requires a lot of focus and discipline. I get more done working by myself. Plus, my wife works with me sometimes doing illustrations and page layout, so I'm not always alone.