How can you feel this alone with billions of people in the world?

Thank god that I have two wonderful children otherwise I think I would drive myself completely insane.  They keep me focused on what is important when I am with them and they dont let me have those mind wandering moments.  I am the type of person that could sit in a car alone and drive ofr hours without listening to the radio, talking on the phone and just mull over everything that has happened and how I could figure out a different way to blame myself for it and how I could change myself to make it better.  I am starting to see that maybe it is not me and maybe she is the one who has changed.  So as I sat in bed this morning (meaning the couch) thinking about what I should do next to get out of this crazy lonely place (again, lots of self talk and blame).  The cool part was that the first thing that came to me was this site and all of the unselfish people that open their hearts to others and try to help them.  The thought that I had before chatting with all of you was that I was completely alone in my situation and that I could never get beyond this point.  Some of the comments are really heart felt and others are reality checks for me and both very appreciated.  So I guess the answer to the question is that mathimatically it is impossible to be alone in the world unless you live your life in your mind and not with others!!!!!!!!!  So thanks to all of you for being an open and honest ear!