This article from the New York Times is worth a read. Even established authors suffer setbacks and get the blues, so if you’re just starting out difficulties can grow out of all proportion.
I constantly remind myself that if it doesn’t come naturally, then leave it. There’s little value in forcing something into being—things take on the flavour of their creator’s mood.
Setting a writing project aside for a while, and tackling something different, some poetry or a short story might free up the log jam in your mind + you’ll get a kick out of seeing a new piece of work flow freely from your imagination. There’s more than one way down the river of creativity.