I'm a well established introvert, and I feel the same as OP. It doesn't have anything to do with extroversion/introversion. It has everything to do with simply feeling bad because we recognize that we're not nearly as productive at home. Some people just aren't, and likely never will be, and that's okay. I consider myself lucky to be able to (a) recognize it, (b) care about it, and (c) have the option to go back to work.