If you're writhing on the floor, howling in pain over the splinter in your finger, you're being a tad melodramatic, that is, exaggerated, affected, or histrionic.

This term was first used in early-19th-century theater, as the adjective form of the noun melodrama, which is a performance piece featuring exaggerated characters with emotional appeal. Outside the theater, melodramatic behavior is also characterized by a kind of performance or exaggeration of emotions, but it's very rarely appreciated or awarded extra points for artistic merit. The common phrase "Quit being so melodramatic!" is a terse way of pointing out to someone that they are overreacting.

Definitions of melodramatic

adj having the excitement and emotional appeal of melodrama

“a melodramatic account of two perilous days at sea”
suitable to or characteristic of drama

adj characteristic of acting or a stage performance; often affected

“an attitude of melodramatic despair”
suited to or characteristic of the stage or theater

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