I too try to distract myself, and then when I am sitting alone on the bus I often find myself crying, because I am left alone with my thoughts.
Empty feels like not really being there when I am with a group. I know I should be having fun, but then I think why am I here I should have just stayed home alone. I fight that by making myself be out with people. Even if I hate it the whole time and just sit there and stare in to space and chain smoke.