even in an accepting, loving family, being a trans teen sucks. There's accidental misgendering, trying to learn whole new social patterns, fighting the medical/psych system, the massive stress of school, wider social alienation & fears, whatever else issues there are at home, the ever greater global precarity, and just the general emotional tumble-dryer that is teen years. It's pretty much always gonna be shitty.
even aside from dysphoria & social pressure, being trans involves killing your past self. I say this metaphorically, but it's still traumatic, even if it's ultimately fruitful. It's an incredibly vulnerable to be rebuilding one's sense of self, and usually at the same time that one's brain is feeling a lot of self-disgust/hatred. That's what we mean when we say dysphoria is hell. As a kid/teen? So fucking hard.