As a fellow songwriter, I'm sure you've shared some of your songs with your family and friends. Without a doubt, you've also heard them say that your song is better than any of the songs they're hearing on the radio. And you know what? They're probably right.
Just because you're an unpublished songwriter doesn't mean that you aren't good - or even great - at your craft. But, even if your song is destined to be a hit, it still might not be cut or even published.