iTunes is not recognizing my iPod so I cannot sync my music, but I can use home sharing and it will work... How do I make iTunes recognize my iPod touch?

I've had my iPod touch for over a year now, and I haven't used it or iTunes in a while. I updated iOS on my iPod and updated to the newest version of iTunes earlier. Now that I have put some new music in my music library (not from iTunes), iTunes will not recognize my iPod, but if I turn on Home Sharing, it will sync to my iPod... Which would be fine, but I have to have Wi-Fi all the time for that to work, and sometimes I don't have Wi-Fi when I leave my house. So how do I make iTune recognize my iPod?