I'm really depressed about graduate school?

I'm barely a few months into it but I feel I don't belong. I feel subtly ostracized by all my fellow students and staff. People,especially women, don't smile at me any more and I don't understand why. Even my supervisor doesn't seem to like me any more. I think it may be because my research is going so slowly and that in turn is because I don't feel motivated at all. It's a vicious cycle. I'm a single male and I have absolutely no one to reach out to. Should I quit? What else can I do? How do I make my peers like me? How do I make SOMEONE like me?