Take me, shape me

When I was little, everything was play dough and sand
Don't like what you've created?
Smash it back into the can and start again tomorrow
I guess I wish things could still be that way
Things don't work out? Start over from what you were and take a different path this time

The thing is, I'm not quite sure who I am without you
It sounds ridiculous and weak, but I'm so scared of losing you for that exact reason
I've watched people run in and out of my life and cried at every exit but you're the constant
So, no, we don't have to talk about it.
But promise me that if things go sour, we can push it all back into that stupid, brightly-colored can and go back to the start