You'll hear a lot about "the writer's voice" and "finding your voice" as a writer. I wish I had a dime for every time I've heard that. It makes me grimace. I think it's b.s.
Yes, you have a voice, but it will develop entirely on its own as long as you keep writing. This is true for poets, prose writers, fiction writers, dramatists, and all literary artists.
This "voice," when developed, will distinguish you from all other writers just as the voice in your throat distinguishes you from all other speakers. Emily Dickinson's poetic "voice" is not Walt Whitman's. Ted Kooser's "voice" is not Kim Addonizio's. Dave Barry's "voice" is not David Sedaris' "voice," although they are contemporaries and both are bestselling comic prose writers from America's white middle class. You could tell them apart even if the name wasn't on their work.
Stressing and straining to "develop your voice" as a creative writer (poetry or prose) is useless, because it happens on its own, the way your speaking voice happened. And it takes time, just like your speaking voice. You had a baby voice, a child's voice, then your adult voice. As an adult your voice doesn't exactly change but certain nuances appear. Same with creative writing.
Emily Dickinson, William Butler Yeats, and Wilfred Owen, for example, all began by writing frothy crap along the lines of public taste. As they went afield in life and took risks in their poetry, and they kept writing, their mature voices materialized and amaze us to this day.
That's how it will happen to you. You can't rush it, or develop "your voice" by trying, or following advice. You can't stop it from happening, either. A teenage writer's voice, often inspired by or imitating other writers' voices, will develop into a distinctive voice at around age 30. Painters develop their individual styles much the same way and on the same timeline. Picasso, for example, was born in 1881; his famous breakthrough painting, "Les Demoiselles d'Avignon," was painted in 1907. If you begin artistic ventures as an adult, expect "finding your voice" to take 6 to 15 years.
After your voice finds you, workshopping won't water it down and trying to write like someone else will fail. Your voice will refuse to desert you.
When anyone starts telling writers that it's really important to work on "developing their voice," I leave the room. The only important thing is to keep writing.