Put me in a box

Please don't put me in a box
I can change at any moment
I am a person
I am growing
I am hoping I can change
My life and make it just a little better
But not too different

I am still me
I still live inside my brain
The same one that I've been in
For thirty-something years now
It's not perfect
But I love it
And I'm the only one to blame

Please don't let me out
It's cold outside and I didn't
Bring my scarf or mittens