There are a lot of layers in this question - perhaps more than you’re even aware of.
Everything about society is set up to discourage trans people from transitioning, yet many still transition. This should be an indicator of just how important and how necessary transition is for those who pursue it.
This much is clear: laws which prevent transgender youth from accessing medical care are not in the best interest of those transgender youth.
Transition isn’t really about quick changes - hormones work slowly and other interventions (aside from surgeries) also tend to take time to develop and manifest. But there are a few things I’ve experienced which might be illuminating.
Not identifying with your assigned gender is one of the worst feelings I’ve ever suffered. I have never experienced any amount of physical pain which even comes close to the psychic pain. You don’t fit in. You might not even know why. You feel different, but don’t have any words to describe how or why.