Gene Veith (God at Work, Reading Between the Lines, Honky-Tonk Gospel, ReViewing the Movies):
All distinctly Christian art must be, in some sense, about the agonizing struggle between sin and grace.
Mere moral lessons, while perhaps commendable, are not enough to be distinctly Christian, since Mormons, Muslims, and ethical humanists could agree with them. And mere optimistic positive messages are not enough and may even be harmful, since they can create the illusion that we can achieve righteousness by our own efforts. Works of meaning and beauty have their own value. But to be explicitly “Christian,” a work needs to be, directly or indirectly, about sin and grace and what Christ has to do with them.
As a Christian, I strive to be self-aware of the things that influence and shape me and the culture around me. Ron Baines’ lecture The Roots and Rise of Pietism in American Evangelicalism does a great job of showing how we got where we are. This really helps makes sense of many of the films marketed to a Christian audience.
It might feel like a general discouragement, but there’s something specific you’re believing that’s giving life to this discouragement. Develop the habit of asking your soul questions. “Why are you cast down, O my soul?” (Psalm 42:5). Make yourself put it into words. Be specific (don’t just accept “I don’t do anything well”). Name what it is that you crave.