Symbolism is used in the poem We Real Cool. The poem is exceptionally short as are the lines of the poem. This shortness symbolizes the supposed shortness of the lives of the characters, hence the line, We die soon.
I'm not sure if that was a typo or not but if you meant We Real Cool, the author is Gwendolyn Brooks. If there's a poem called You Real Cool and I just don't know about it, I'm sorry I have no clue...