If i met a teenager like this in real life, I'd be careful not to discourage them. Even knowing how misguided they are....I think teenage years are a good time for this type of idealism.

With one caveat....I'd knock em down on the self-importance part. Like the 'my song made girls all over the world feel like they could be who they want'. That stuff I'd probly temper with a little forced humility.

But all the theoretical physics stuff...yah, it's groan-inducing and laughable...but teenagers who show interest in stuff like that are usually better for it as adults later on....even when it's pure bullshit. They just need a little more humility.