Writers are fair game for anyone with a "terrific idea" for a story. There is a part of me that truly understands this. We want someone to like what we have to offer. For that reason alone, I hate to reject anyone who offers me ideas and I always listen politely to story pitches.
Consider creating a few writing rituals. Rituals can help you set the mood. They help you turn your writing brain on and everything else off. Great rituals range from a cup of coffee and an outline to meditation or a quick walk around the block.
Good writers do not channel in from some higher plain, they are simply human creatures who have a talent for expression and a talent, as Noel Coward would have said, to amuse. Everything they write is an expression of their selfs.