show them exacly what they just told you.
when ever they ask you what you want, wether it be food, clothes, toys, tell them what they just told you, it doesnt matter.
keep telling them it doesnt matter what you want, and tell them to just get what they want. they might tell you to not be so silly, and that ofcouse it matters what you want, but tell them "no it doesnt" when ever they ask you, why you feel as though it doesnt matter what you want, tell them they wont understand.
and when they start to get upset, tell them what you want. and if they luagth at you, yell at you, or tell you your silly, say, i told you it didnt matter, and that you wouldnt understand.
do this long enough, and maybe just maybe, what they dont understand might start mattering to them.
hugs.
Unfortunatelly, I didnt come out untill I was 25, But by this time, I was old enough and misserable ehough, that when I told my father that, I wished I wasnt the way I am, And that no matter how hard I tried to make It go away it wasnt going too. He understood that, If i couldnt make it go away, he couldnt do anything about it.
I dont know how old you are, but it seems as though you younger then I was when I came out, and if so remember this, no matter how far in the future things might seem to be, your still even as you are now, closer to things then I was.
Hugs