<Nods> There's a lot of things in this world that is hard to wrap your head around until you experience it yourself... The problem isn't the lack of understanding, it's the lack of acceptance despite not fully understanding.
Actually, I am(kinda, if demigirl counts)a cis person who WAS actually trans at one point in my life, but I was not accepted whatsoever so I basically gave up and now here I am today. And yes, I do understand it, even though I'm not trans anymore
But if you can't be trans and then not, how do you explain me feeling more like a boy than my assigned gender(female), and then a bit later I feel like a girl again? And then now I'm demigirl.
Take a trans woman for example.
She has ALWAYS been a girl. But her sex didn't align with her gender, therefore society said her gender was a boy even though she wasn't.
She had to discover herself and found out her gender was female.
Yeah that does make sense. But what does that make me? A long time ago I discovered that I identified as male, but it went away and now I am who I am today.
