I just subscribed to iTunes match but only 61 songs from my 7GB of music on my iphone showed up. I do not want to lose any music. What should i do?

I just subscribed to iTunes match but only 61 songs from my 7GB of music on my iphone showed up. I do not want to lose any music. What should i do? When I go to settings-music-and try to enable iTunes Match on my iPhone it says "iTunes Match will replace the music library on this device" I don't want to do that it only has 61 of my 7GB of songs.