Well you've gone from gonna to maybe in three days. That's good. Stop the negative self talk now. Your parents aren't going to change their beliefs to accomodate you, but they may have enough reason to now to educate themselves about you. Helping them with that could be benificial for you. You need to stay away from anything negative about this. I know. I was just there, only worse, a couple weeks ago. I'm still having problems concentrating on anything positive.
The understanding isn't about transgenders so much as it is about all of your worlds seeming to have turned upside down. Take the time that you can to reorient yourself to the world and your parents, too. That was a huge change for all of you just a few days ago. Let it go if you can. Maybe your parents can do the same. It's not like you just did something stupid, you haven't changed so much as the world just did.
Ativan