Hello Crayola Crayon,
Thank you for using Apple Support Communities!
It sounds like the music library you used to have is no longer showing up when you open iTunes, and it is instead showing you 3 songs you did not purchase.
I was thinking that it might be possible that the iTunes library got moved or iTunes is looking at a different library than what it was. I would look around your computer for a folder named iTunes and if you find one that has your content in it, and use this article to point iTunes back to it.
iTunes: How to open an alternate iTunes Library file or create a new one
If you just cannot find an iTunes library with your content in it, you always have the option of redownloading your purchases from the iTunes Store free of charge:
iTunes 10 for Mac: Download previous purchases from the iTunes Store