You pose a great dilemma here, and one that has probably kept many a man from taking the plunge. I, myself, would be interested in living as a woman, but never at the price of completely giving up my masculinity. I could enjoy it as a temporary thing, but it would soon lose its appeal if it became a permanent thing. To make that kind of change one has to be truly committed (or completely forced into it against your will!).
I wonder if there are people out there who misinterpreted a particularly strong fetish as true transgenderism. There is a difference, of course, between the two, and I imagine it'd be easy to misinterpret one's feelings on the matter.