[LAU] my CD-R sounds weak and bland. What to do?

I wrote and recorded a nice little 7 tracks worth of sterio audio using Audacity set to CD quality. It all sounded great as a project file, and the burning of the CD showed no errors, but when I play it on the sterio it sounds so weak and bland compared to store-bought music CDs. What can I do to get some life into it? I know next to nothing about the production side of audio, so any comments, web sites where I can get information, or information of any kind would be appreciated. I have a major restriction with my recording. It's almost all done directly into the computer without microphones because I have to keep noise levels low around here. Bass sounds just fine this way, and even the electric guitar through a Korg box, but forget about loud guitar amps or PAs or anything like that. I do the vocals and harp on those rare times when no ones around. But the end result, the Audacity project file, and the .WAV file I export from it, sounds just fine. Its the burned CD-R on the sterio that sounds bland compared with regular music CDs. Something is missing.