Cindy this biz is tough and you need a thick skin. We have been telling you that since the first post. Sadly few can make a decent living from songwriting...not necessarily as you may have discovered does the best get chosen and backstabbing and nepotism are commonplace.
You have to learn the craft but more important you have to network and rub shoulders with folk who may be able to introduce you to other folk who can get you more introductions. That is the way it works and has always worked. Who you know counts not what you know. Learn to write better stuff than the crap we hear on radio and learn who to pitch it to.

http://www.soundclick.com/bands/songInfo.cfm?bandID=687727&songID=5238055