I feel really alone right now. I don't know what to do.?

I'm a 19 year old girl. My best friend stopped calling me her best friend and started calling someone else their best friend. I am trying to get ready to move out but I don't really have many friends and don't know who I would live with. I feel really disconnected from everybody and I seriously think I have a social disorder. I would live by myself but I can't afford it. I've never had a boyfriend and everyone seems to be pulling away from me or I'm pulling away from them and every time I see my friend call someone else her best friend I think I truly die a little inside. It's like I'm not good enough anymore and I put value to myself and can stay afloat but it just feels really bad and I'm not close with my family at all. I hate the feelings swirling in my head...It's like this intense need to tell people everything but nobody wants to listen or wouldn't understand and would give me some corny advice. I felt good for a while but everything seems to be getting out of reach. I don't believe in God, but the only thing that seriously gives me hope is music. I find how I really feel in the music I listen to and can relate. What do I do?