I have no helpful advice beyond continuing to keep an eye out for other like-minded types, but I hope you find people, and that there do turn out to be some societies that are what you're looking for. One of my biggest regrets about my time at Oxford so far is being too shy to involve myself in geeky societies; I have some lovely friends, but I really wish I had thrown myself into societies from the start, because I really feel the lack of fannish friends sometimes.