I am not visibly trans, I don't out myself to many new people, and the people who know keep my history confidential. Basically, the people who are important in my life know, and the people who are/were involved in my transition know, and everyone else can ->-bleeped-<- off. So I'm some degree of stealth.
I choose not to disclose simply because I don't really want to be "the trans girl I know." Like it used to be "the gay person I know," and before that "the black person I know." I'd rather be allowed to be a complete person.
If someone really desperately wanted to they could probably track down who I used to be. Which would be irritating, but hardly devastating.