You think you get it? Think again.

[Ryuu]

So, you'll accept me as transgender. I like that part, you call me the right name and pronouns. It's pretty nice.

But there's the flip side of that, isn't there? You call me by the right name and pronouns because you desperately hope it'll be enough, that I'll somehow be swayed from going on those nasty artificial hormones or cutting off my breasts.

Well ->-bleeped-<-ing think again. You think this is all about "gender roles", that I just want to be in a male gender role? Do I act masculine? No, I ->-bleeped-<-ing don't. Because I'm not masculine. I could care less about gender roles. It's not about that, and it never will be.

Because you're my mom, I've spared you the gory details, but I'm a big boy now, and if you ask me again why I can't just live as a boy without transitioning, this is what I'm going to scream:

I AM NOT TRYING TO GET PRIVILAGE

I AM NOT TRYING TO LIVE IN A MALE GENDER ROLE

ALL I WANT IS A FLAT CHEST AND A PENIS, DAMNIT!!

[Renate]

You're right.

I'm amazed at how many people can reconcile themselves to you being transsexual.

Then you mention surgery and they flip out.

Why don't they see that that as a clear and logical conclusion?

[Cindy]

People have a terrible problem with 'I'm normal, I'm just not like you' Courage friend.

The hatred is a starting point.

Cindy

[Alex37]

But there's the flip side of that, isn't there? You call me by the right name and pronouns because you desperately hope it'll be enough, that I'll somehow be swayed from going on those nasty artificial hormones or cutting off my breasts.

Well ->-bleeped-<-ing think again. You think this is all about "gender roles", that I just want to be in a male gender role? Do I act masculine? No, I ->-bleeped-<-ing don't. Because I'm not masculine. I could care less about gender roles. It's not about that, and it never will be.

This sounds a lot like my boyfriend and I right now.  I don't understand why some people get it and other don't.  Sorry man.

[spacial]

Ryuu.

That was a perfect way to state it. I can completely identify with how you're feeling.

[espo]

You get it, they don't. No ones FAULT.

[Juliet]

So, you'll accept me as transgender. I like that part, you call me the right name and pronouns. It's pretty nice.

But there's the flip side of that, isn't there? You call me by the right name and pronouns because you desperately hope it'll be enough, that I'll somehow be swayed from going on those nasty artificial hormones or cutting off my breasts.

Well ->-bleeped-<-ing think again. You think this is all about "gender roles", that I just want to be in a male gender role? Do I act masculine? No, I ->-bleeped-<-ing don't. Because I'm not masculine. I could care less about gender roles. It's not about that, and it never will be.

Because you're my mom, I've spared you the gory details, but I'm a big boy now, and if you ask me again why I can't just live as a boy without transitioning, this is what I'm going to scream:

I AM NOT TRYING TO GET PRIVILAGE

I AM NOT TRYING TO LIVE IN A MALE GENDER ROLE

ALL I WANT IS A FLAT CHEST AND A PENIS, DAMNIT!!

If your mom is willing to accept you as transgender and call you the right name and pronouns, I wouldn't be so harsh on her for being concerned about you permanently altering major parts of your body. 
My mom got pissed at me for wanting to get my eyebrow pierced.

Plus, from what you wrote, it sounds like you're asking the lady to understand that you are transgender yet unconcerned about gender roles.  Thats going to be confusing for a LOT of people, including myself at first.