I think that saying, "a transsexual" objectifies it - makes it a noun - makes it something outside of myself that I've acquired. Saying "I'm transsexual" makes it an adjective, just another part of my gestalt. I prefer the latter.
I have been considering, though, to explaining it just as a major league, humongous, life long hormone imbalance that I've finally built the courage to confront and treat.
Or is that being too much of a victim?
hugs & smiles,
helen