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.