Every time I get the opportunity to come out to my mother, I freeze up and lie.

I told her that my dad keeps talking about gay people and expects me to laugh, and then I started telling my dad about my one gay friend, the transguy that went to my school last year, the school crossdresser...and how my dad thinks that transkids don't know what they feel and shouldn't be allowed to make such a decision when they're so young (which pissed me off because I couldn't say anything.)
I told my mother that I'm just waiting for one of the kids in my dad's side of the family to grow up gay because they couldn't even handle when my uncle married a black woman (who is a good person, mind you, not that they care.) Then, I suggested, what if they had a transkid in their family. My mother said that my dad's side of the family would freak out and that it would be one thing for someone in that family to be gay, trans would be something worse for them.
Then, I started going on about transpeople and basically the mentality and stuff (well, from what I've observed here and my own feelings), and my mother said, "Are you gay?"
My heart sank slightly, and I said "No." - which is true - "Why?"
Then, she asked, "Do you have problems with your body?"
That right there. I really wanted to break down and say yes. I really wanted to say that it causes me so much distress that I can't handle it and that it causes me to self-harm. But for some god damn reason, I said, "...Sort of."
After that, my mother said, "Good. You're a normal teenager. You know, you could be a sex therapist."
And then she went on about how I understand the feelings of gay and gender-different, I guess - I can't think of the word I'm looking for - people and that I'm open-minded and that I could help them or something.
Damn it. I keep screwing up and lying. I really want to tell her, but I get nervous and freeze up, and then something in me tells me to lie, but I can't stand it anymore.
Damn it. Damn it. Damn it.

Edit:// Also, before we went through my room, I forgot that I had my binding stuff in a shoe box and I freaked out because she was just about to come into my room to help me find what I was looking for, and I freaked out, stuffed all of my binding stuff into my backpack for school and took it downstairs so she wouldn't find it.