Shared libraries from other people's libraries showing up permanently on MacBook Pro. And a lot of purchased and ripped songs vanished... Anyone...please help...?!?!

Shared libraries from other people's libraries showing up permanently on MacBook Pro. And a lot of purchased and ripped songs vanished... Anyone...please help...?!?!

The home sharing is now off and still has all the songs one there. Even rebooted the wifi modem, supporting hard drives and all computer involved in this catastrophe!! :( all computer are all updated and updated to the new iTunes.

Please any help would be greatly appreciated and any more questions welcome. Thanks