Pretty sure I am INFJ. So much of this thread resonates with me. I am definitely an introvert, love my own company, am more comfortable listening than talking (which is why I love my work so much -- I am a professional listener!).
Janet, I can so relate to your description of your husband and his boisterous family; sounds just like Michael's. We spend Thanksgiving with them, and at some point in the evening, I always slip away from the crowd and lie down alone in a dark bedroom to chill out. I just get overloaded by all the noise and static!
And Lisap, I can relate to your party-throwing, to a degree. We hold one big party a year in the fall, and it's usually a lot of fun, but right before people arrive, I wish I could cancel it. What I really enjoy is the planning and the prep, but the anticipation of arrival is almost crippling, and sometimes even in the midst of the fun party, inside I'm thinking, "Okay everyone, time for you to go so that I can have my house back."
I remember feeling incredible anxiety before the Boston YLF meetup, and then being amazed that I spent more than 10 hours with the group before heading back home. Sometimes group experiences are wonderful.