awww, dude
Don't feel bad. I think what you're describing is part of the human condition. Everyone goes through feelings like this occasionally. It's probably nothing to worry about, your phone friend may have been busy/having a rough day herself. As for your internet friends they probably weren't doing it on purpose. It's also worth keeping in mind that chances are when you get down on yourself like that, and get all paranoid, you really might not be as great company as you usually are. Sounds like it might have just been a crummy, negative cycle.
So remember you are wanted. You're a valuable, wonderful human being with tons to offer people!
My advice is to take solace in that fact and then just take yourself out of the negative situation. Go have a bath, read a book, watch a movie, whatever, just do something you enjoy that'll put you in a good mood and forget about it. Then next time you're online/on the phone with these people just be your typical self and carry on as normal.
-Kevin
BTW: I'm not advocating avoiding your problems or pretending they don't exist, but based on what you've said in this thread they don't seem to be any one, tangible thing that can be much helped by thinking about and working on.