I Want My MP3

So I've joined a couple of sites that allow me to showcase my music. I songs I wrote & recorded were on CD and then transfered onto the comupter. When I tried to put them on the music sites, I was informed that an MP3 player was needed in order to make it work. It's amazing how the technology is these days. People from around the world can read my writings. Yet at times I struggle with the technological aspects of putting things online. When I grow up, I hope to be a computer geek.