So how can you discover yours?
I recommend writing from your heart. Your writing voice stems from within deep you. How you think and express yourself will eventually come out through words and phrases. If you focus on trying to have a certain voice you will get stumped. I think the best way to find your writing voice is to write daily. Even if you write in a journal. And don't worry about the fact you have fragments. Put them in. And keep writing. Writing rules can be broken when it comes to incomplete sentences. I love using them. So do others like Max Lucado. Obviously too many fragments is annoying to any reader. Balance is key.
Here's a quote worth pondering from On Writing Well:
My commodity as a writer, whatever I'm writing about, is me. And your commodity is you. Don't alter your voice to fit your subject. Develop one voice that readers will recognize when they hear it on the page, a voice that is enjoyable not only in its musical line but in its avoidance of sounds that would cheapen its tone: breeziness and condescension and cliches.