IMO, who cares if your song sounds like the style of someone else, unless you've unwittingly copied their whole tune or some big chunks of lyrics. Songwriters don't have a copyright on their style. And even if your tune or lyrics are very "derivative," heck half the blues songs I've ever heard seem to have exactly the same tune and I could say similar things about bluegrass, honky-tonk country, etc.   And lyrics seem to travel from song to song very easily within the "folk music" genre.