I am also a semi-introvert, work with people all day long, but they are not tiring people, but really enjoy my creative time, but don't like to push myself getting something done, its my leasure time. Tried a quilting group for a little while, even if they only meet once a month, it was sometimes hard to make it that one night, something always interrupting so quit going, they are into charity quilts and I don't like the rush to get something done. One of these days when I retire and get all my todo's done I'll join again.