i'm not ftm but i feel for you. it's really hard keeping something like that from your friends that you make. you want to be close to them, to anyone, but keeping something like that makes it feel like you aren't as close as you can really be.
i think being transgender is like a litmus test of whether these people are worth having in your life or not. i know you want to avoid being talked about by everyone, hell so do i, so do we all. but i think you'll find, if you confide in people you feel are trustworthy, you may be surprised at the reaction. with the good comes the bad, and there will be people who are jerks about it. but now you know that those are the types of people that aren't really necessary for you to keep around. when you find people who accept you, all of you, and respect you as a human being... it makes it worth it in my opinion.
its not EVERYONES business. but if you feel like you need to tell some people... i don't see the harm because from my experience, if you pass, people are more willing to see you as you are regardless. you definitely pass, so if you told me, i'd still call you a guy and he. you've conditioned people to see you as male. thats hard to break. like when parents call their ts child the birth gender out of habit. its what they knew them as, and your community knows you as male.
stealth was annoying to me. so you know what i did? i posted my story in a magazine. yep. i did. and you know what happened? not a damn thing. it's not the end of the world if you're transsexual and some people know. you should feel empowered you look as good as you do.
my 2 cents.