how do i tell if ppl downloaded my shared files?
 

can someone tell me how will i know if someone downloaded my shared files?

You can see if someone is uploading from you by watching the green 'up' arrow at the bottom of your screen, or by clicking on 'Monitor'.

Within your library, look at the 'uploads' column. The number on the left shows how many times the song's been successfully uploaded, the number on the right shows how many times an upload's been attempted.