I know exactly how you feel. I've been alone for most of my life. The only living thing I know that cares about me is my cat. It is difficult to learn to be comfortable being alone. And being depressed on top of that, you have a whole new level of difficult. I wish I knew what to tell you to help you feel better. Sadly, I don't. From my experience, just doing your best to get through each day, is somewhere to start.