Hello David, 
I appreciate your post very much. 
 
Is it? Can you please provide a link for the melody so that I could hear it? 
And what about the ending and middle parts? Does they remind you with something else? 
I composed this variation-melody based on my previous composition ( If you heard it (and I think you did) you will notice that they both have the same chord progression except that the first one is a little bit popish. What about the first variation, does it remind you with something else, btw? 
I remember that I composed my first composition in front of my keyboard and worked on it about one year (not continuous working of course :) ), and ended up with a modest melody of about 3:00 min. The motivation of my first composition was a special event in my life (nothing else). However, when I posted it in music-composition forums, most of the reviews said that it reminds them with a melody or advertisement music but they don't what it is exactly! I think this is my destiny!