Your opinions do not equal facts.
https://www.nature.com/news/sex-redefined-1.16943
https://blogs.scientificamerican.com/sa-visual/visualizing-sex-as-a-spectrum/
I however have scientific backing. But keep telling yourself, it's "just my opinion".
Have you even read their posts?
They already said there can be more then one sex.
They’re saying you can’t change your sex, no amount of therapy or medical treatments will change your sex. Your DNA will not change.
You can change your gender yes.