They say that truth is stranger than fact and one of a writer's greatest inspirations has to come from the writer's own life. Whether a writer has experienced tragedy or joy, success or failure, love or hate, there is plenty in a writer's life to be mined for creative purposes.
Everywhere we go we are touched by life. The people we meet, the places we go all impact on us, whether consciously or sub-consciously and though we might not be aware of it at the time, the seed of our next creative project might have been sown and given time will grow into a workable idea.
So even when life is frustrating and the universe seems to be against you, smile and remember that whatever happens, it will appear in your writing in some shape or form sometime in the future - nothing is wasted.