Give me one word that describes this sentence:

A person who acts the opposite of what they feel to gain attention.

Hypocrite

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One who plays a part; especially, one who, for the purpose of winning approbation of favor, puts on a fair outside seeming; one who feigns to be other and better than he is; a false pretender to virtue or piety; one who simulates virtue or piety.

This is what I would say, there maybe another word for it. Good luck