I'm in a similar situation at York (I'm first year too). I speak to people at society things and during my course (it's the exam period atm though) and I've met lovely people but I have no good friends here that I can just hang out with comfortably. I'm friends with one of my flatmates, but we don't necessarily talk that often... although when we do, we sometimes do have long chats so I suppose that's nice. I'm trying to stay hopeful! I don't exactly have any advice, but you're not the only one : )