I have always felt poly to some extent, but not everyone has. Some poly people however have strong ideas about what "all polys" are or are not. Things like kinky, geeky and pagan come up a lot. But there are many polys who are not these things.
I think you should tell her how you feel. And I assure you being poly doesn't really depend on what other things you are, as much as some people seem to believe it does. So don't worry about it.