You can be trans and be completely mentally healthy, not all trans people have gender dysphoria. And you can whine all you want but the studies show trans people are *much* better off in an accepting environment and being provided hormones and SRS. As for trans children, most studies show the majority of trans children are correct in that they are trans, and usually know prior to social transitions. Most studies also show trans children are better off taking puberty blockers than not.
https://www.theatlantic.com/science/archive/2019/01/young-trans-children-know-who-they-are/580366/https://pediatrics.aappublications.org/content/137/3/e20153223"In sum, we provide novel evidence of low rates of internalizing psychopathology in young socially transitioned transgender children who are supported in their gender identity. These data suggest at least the possibility that being transgender is not synonymous with, nor the direct result of, psychopathology in childhood.27 Instead, these results provide clear evidence that transgender children have levels of anxiety and depression no different from their nontransgender siblings and peers. "