Thanks for your advice. I started to feel like it was going to be "easy" to reveal, and thinking the consequences would be easy to handle, but it is not the case.
The friend I told to I was crossdresser is the one who tried to limit the possibility of being outed. And he gave me a few bits of warning, as it is really easy to say something (woman related) too comfortably, and be found out. I know one of my friends has some doubts about it, but I still lie to him about it (at least for the moment). I'm being careful, and my next time out is a comic con in April, so I still have some time to think about it.