Welcome to Susans!
(sorry my post in long -.-)
I've come out to several friends in person over the years. All four of them have been very supportive, with one of them even buying me my first binder as a surprise. All of them said that it made sense. My brother has known for many years, but was too busy having personal problems to do anything. He says he's happy to finally be getting a little brother now that he's able to be around for me. I have one creepy grandmother who's very narcissistic and just crazy, but even though I haven't come out to her yet, she did research a few years ago on FtMs, called me on the phone to tell me she didn't care if I was L, B or T and bought me a men's watch for my birthday.
I was terrified of coming out to my parents as well, since I live in the bible belt, they're both fairly religious, and my mother has pretty right-leaning political views. After a while, I got to the point where it was either suicide or transition. I came out to my parents about two months ago by writing them each a letter (I posted them on here in the Coming Out forum, if you want to read them). It was a bit of a shock to them; although my mother had been questioning me about my sexuality for many years and said that she knew something was wrong, it seems she always thought of me as a prudish feminist or something.
In any case, my parents have tried to be supportive.
Starting a week after I told them, I began regularly attending a teen LGBT support group full of awesome people! I've been seeing a gender therapist once a week for just over a month now, and my parents have gone with me to a transgender support group to talk to the doctor who heads the group (she is also a post-op transwoman) to better understand certain social and medical concerns they were having. I can't start hormones yet, because there is a possibility of me having some kind of intersexed condition or some other reproductive problem that may affect how my body reacts to T, but my parents are already working on getting that dealt with so that I can begin to transition medically. My mother calls me by my new name almost constantly, and is working on pronouns, even going so far as to correct my dad when he slips up. Many people at my parents' church know about it now, as well as several of my mother's friends and also one of my aunts we told recently.
My school year started about 4-5 weeks ago, and I've been going to this school for 4 years now. It's a small school where everyone knows me, but I came to school wearing a binder and gave notes to each of my teachers and some of the students. There are only two teachers who do not call me Vincent and do not use male pronouns. One of them calls me by my last name (but still uses she/her/etc), and the other just doesn't call me anything.
I know I've had it easier so far than most people (from what I've heard), but I hope your coming out goes well too!
People can surprise you. My mother used to make comments about how she didn't understand transpeople for changing the wonderful bodies god gave them (she thought of SRS kind of like plastic surgery/botox/boob implants/etc), but she speaks differently now that she knows it's affecting her kid, though she doesn't pretend to understand.
