Vampires among us

There are vampires among us. No, they don't drain us of our blood, but they do drain us of life. They are the people in our lives who constantly expect to be able to lean on us, without ever being there to be leaned on back. They are the people in our lives who don't bother to have a concern beyond their own immediate, short-term satisfaction, thereby typically ignoring any concerns or issues that might affect those around them. They are the people who take, take, take, and never, never give. What the hell is wrong with these people? I for one don't wake up thinking that everything in my life is going to be OK regardless of my own lack of effort, expecting that someone else will always be there to handle it ... am I the odd man out?