I think I get what you're saying. Personally, I suck at introducing myself and never really know what to say, but I try to first talk about things that are definite (I'm a 19-year-old girl, have horses and dogs, and live in the USA for example) and then generic/broad interests (animal lover, veganish, artist) and after that if I need to continue talking about myself, I'll get into "fandoms." They may be serious, deep interests and might have had a huge impact on me, but they're not as solid as my other interests. Shows get cancelled and no matter how much you loved it after a few years there just isn't as much of an active fandom and it's not that big a part of your life anymore. Or the producers/writers/whoever do something crazy and you don't like it anymore. So yeah . . . let your identity rest on a firmer foundation. Fandom is just the decor that gets changed around periodically.