I'm a little sleepy, so I won't write as much as I typically do, which is a lot
If you really REALLY feel like it can't get worse, then as cliché as it sounds, you really have nowhere to go but up. Knowing, or having someone say, that you're your own worst enemy can be extremely painful, especially if you know it's true. But it's a great place to start healing.
There's no way to fail at friendship. Some of my best friends just sit around and say nothing. Friendship can be as simple as that, or as complicated as all-get-out. Wanting to be loved, or have friendships isn't selfish - it's as human as being born. And in my book, we all deserve love from the moment we're born. Friendship until proven guilty. You haven't done anything to deserve it, from me, or from yourself.
At the end of the day, there's only one person you absolutely have to be friends with anyway: somebodysomeday. I suspect that the reason you don't feel comfortable or loved by your friends is as simple as this.
So do something someone you'd respect and love would do! Go give some money to the Girl Scouts (mmm.. Thin mints...), or learn something fascinating and new. Or write a forum response that's WAY longer than you meant
*more hug* - bookmark what nowheretorun said, and read it every time you feel low.