I have to admit my first thought was along the lines of Don's when I saw the song length. The only guitarist/songwriter that kept my attention for that long was Harry Chapin.
However, the song has a sweetness to it. Your vocal blends with the guitar picking very well to where it is a very nice song.

There is also something about the simplicity of a voice and acoustic guitar when singing songs with this theme that makes it very sentimental for the listener.

Very good job!
Cheers!
RickeG