I'm Fustrated and worried

Hi, due to my main pc's cpu dying i had to take my pc in for a cpu replacement, and i am left with my "Craptop" however, i want to sync the songs that are on my laptop to my iPod Touch 6th Gen, but when i try to do that itunes says if i click the sync box all music currently on the ipod will be deleted, and i dont want to delete the music currently on my ipod, im so worried, and im also fustrated, oh and yes i have authorised my laptop.