The speaker uses music to describe how ordinary life feels until someone special enters it. The first half is modest, even a little deflated. Her world would be an "overplayed" artist, something worn out and too familiar, and her life as an album would be "kind of average." There's no drama in these lines, just a quiet admission that things feel routine.
Then the poem turns on the word "if." Once "you" appear, the song becomes "electric," and the tone brightens. The last two lines carry the main wish: being called "yours" would turn the speaker into a favorite record, the one you return to again and again. It's a nice twist, because "overplayed" earlier sounded tiresome, while a favorite record is played over and over out of love.
The mood is shy, hopeful, and a little wistful. The speaker doesn't claim to be extraordinary. She just imagines how being chosen could change everything.