In "Show & Tell", Melanie Martinez is speaking to a certain kind of pressure that comes along with her celebrity. Basically, she is in the crosshairs of paparazzi. Or more to the specific point of this song, sometimes people want to get close to her even when she does not want or is prepared for their attention.
Or another way of looking at it is that Melanie feels she is always on display and at the mercy of public opinion. That's why she named this song after the popular children's activity "show and tell" where participants exhibit an item to a group of people and talk about it. She feels as if she is being treated like one of those items. Thus she entreats the listening audience to remember that she has the same type of emotions that they do. In other words, Martinez invokes the golden rule in trying to get others to sympathize with her emotions.
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The K-12 Album Lyrics and Meanings
De TodoHere our the lyrics and meanings of each K-12 song in Melanie Martinez's album :)