If you want to do something, that's a different story.
Maybe think about the feeling alone part and why that makes you sad. I know that sounds like a "duh" question but it really isn't.
Are there things you like to do that you could do "alone"? I found several things like taking a class in something I'm interested in, biking, walking, movies (that was a hurdle for me but once I got over it, I loved it). Have you ever volunteered? It's a great way to get outside of yourself and provides an opportunity for perspective.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss