Initially, for myself, finding a label that I identified with was about validation: validation that I wasn't the only one to ever feel this way, validation that even though I do feel this way I'm deserving, validation that I'm not just some freak accident. I fully believe that sexuality in and of itself is fluid; I believe that every major stage of life has the ability to shift the sexuality of people in general but more so of myself. I've definitely gone from saying "I am THIS" to "I'm somewhere in between here and there, and sometimes it's as simple as depending on the day". But it's still, somewhat, about validation for me - when I explain how I feel to others, I have a word that shows THEM that I'm not just making something up to be "special".
So basically we live in a society full of assholes where you feel as though you need to not only explain anything to them to begin with, but to identify with a sexuality in the hopes that they don't think you're trying to be 'special'? Because if you were some wonderful, amazing 'freak accident', that would be horrible, right? Isn't that rather sad?