That's not just a metaphor but it is also a metaphor.
Once upon a time there was a little girl named Marjorie. She was usually called Marjie but sometimes she was know as Iggie.
She tried school. It wasn't a great fit.
She leapt into life with unbridled enthusiasm.
She had many adventures.
One day, she decided she wanted to be MJ, rather than Marjorie, and have some holes in her nose.
She had more adventures, including a nice visit to Europe.
And one day, she decided she needed some braces.
Then one day, she no longer needed them.
But in the Duchy of Metaphor, if you ever want some (more) bracing, of any kind, smallish or largeish, the Duke of Metaphor (aka yer dad, sometimes known as me) is always reachable and ready to assist. And the Duke is a stone-cold, awesome genius, yo! He can figure shit out like a motherfucker! Remember dat!
I love you, my little MJ!