Unfortunately, I believe you DO NOT need to have dysmoria to be transgender. Dysmoria is a medical condition; whoever has it should get help right away. Saying that every trans person has dysmoria is like saying every one of them should have a medical illness.
Of course, most trans people have dysmoria. Why? Because it what drives them to become trans. I'm a female, and yes I really wish I was a male, but I do not have dysmoria. Because I don't have a push factor (dysmoria) to transition, I'm not going to transition. For the first part, it is hard, difficult, and one does face a lot of criticism from it. Of course that doesn't mean that other people like me, who don't have dysmoria, wouldn't transition. It all depends on the person and what limitations they have. (For example: I have a very anti-lgbt family, if I was trans I'd be hated by them)
I hope you respect my opinion and take it into consideration. :)