Our ability to get ourselves to move from thoughts to actions is self-motivation.
It is the ability to do things on your own without being told to do so.
It is a fire within that lights our path and drives us to do and achieve something.
A self-motivated person feels he wants to and not he has to and thus is happily satisfied.
It is the name of the fire within, the inner desire, willingness and eagerness and own enthusiasm and ambition that drives one towards success.
Only a self-motivated person achieves the desired results as s/he has the real motivation, the self motivation.