But do you even find your life to be significantly harmed by your smallish stature? There are short people who never had brain injuries, and it's generally not such a concern that we feel the need to make them larger. Lots of them even wish they were taller.
And it's a pretty frequent straw-man to compare tomboys to kids with persistent gender dysphoria. They only seem superficially similar to people who really haven't engaged with the huge breadth of research on trans people over the past century. It also ignores the fact that there are feminine presenting trans masculine people (those born female, who medically transitioned, but still present femininely), or tomboy trans feminine people (born male, medically transitioned, still present masculinely).