a prime example of a tough decision...

do i say automotivation or
do i say self-motivated?

it depends.

automotivation can be applied to many things, including you, that are alive and unliving.
self-motivated, i believe, is mostly and interpersonal term, with an added familiar emphasis to it, but both words share a largely common meaning.

in any case, my book from the library doesn't say this.
though, we mustn't forget, to return the books we borrow, right?

hah hah

where the big difference is lies in the answer to: why don't we say self-biographed report instead of autobiography?