I Am Depressed Because I'm Lonely

I realize I am the only thing stopping me from branching out, and having people in my life.
Yet it feels that each time I put myself out there as I am to find people, it failed. And you get tired of the rejection after a while, and I question myself and invent all of these reasons.
It seems like a fact to me that every one else already has what they need. And people's friend groups are all filled up with no vacancy.
Being the lone wolf was fun for a while. And now it is tough to re-enter society.
People are scared of those they don't already know, I convince myself. Maybe I am afraid of keeping on laying my vulnerable self on the line.

So it's tough to know that I am the one who has to make a move. I find the courage to do just that, but the repeated results of being treated like an alien from some other planet sure makes trying a tough gig.