Unstoppable rolling ball

This is me on the move!
Picking up
From where I left;
Determined to move to
A higher gear;
And from there
To the highest gear;
The determination
Which shows on my face:
Tells at once
How hard it is for me
To be stopped;
That, indeed, is true.
I am simply unstoppable.
Just what I like
For you to be.
A rolling ball,
That is unstoppable.