I have effectively no training in music theory, and have only ever produced a handful of "songs" (unpublished files on my hard drive, resulting from aimless experimentation with production software).
While I attempt to be as original as possible, I invariably realize, long after I've finished a piece, that it shares a significant component with an existing song. I subconsciously copied something major from another song, while under the impression I was creating it from scratch. I understand the truism that good artists copy, and great artists steal, but the similarities are too great to remain satisfied with my piece as an original work.
Is this is a common psychological barrier in music production? Are there any solutions to help ensure the time spent producing is actually yielding original content?