Itunes not recognizing my ipod on new mac

Hey all,

Just got a new macbook pro and I am trying to put my music onto itunes. So I downloaded the latest itunes. Well now whenever I pull up itunes there is no music at all on the screen. But when I click on my ipod and then click "on this ipod" it recognizes all my music. I am logged in under my apple ID. I havent done anything different but itunes will not recognize my music. When i got to sync my music, it says there are 0 songs when there should be 82. I am so lost and do not know what to do. I'm sure this post is very confusing to readers as well. Any help would be greatly appreciated. Can I take my macbook into the genius bar and have them help me?