@Jason, Couldn't have said it better myself! I'm not gonna introduce myself like "Hi, I'm Sam, but call me Reuben because I'm an FTM transgender person!" But, if it comes down to the issue of proper pronouns and my new name and such, then it'll come out, and, as you said, if they don't like it, they're not worth the time and trouble of being in my life.
@Abendroth, My mother is the same way. Actually, on Monday, in addition to the tornadoes that have ravaged the South (my city included), I had to deal with her arguing with me because I want to see a counselor that is actually trained and has experience with trans* people, and she will have no part of it. I was told that she was about to "lock me up" and give me shock therapy.

Anywho, there are also older pictures of me with my long hair and girly clothes in my house >_< And, of course, I will tell someone interested in me immediately, even before we start dating, just so they know my future plans and the way I am now.