One of the hardest sacrifices celebrities make to maintain their lifestyle is their privacy for a life of stardom. And in Hollywood, unfortunately, there are no perks to being a wallflower.

On the surface, you would probably have never guessed, but many of the biggest names in the world are a lot shyer than you think. From Miss Sloane actress Jessica Chastain's stage fright to "Still Got Time" solo singer Zayn Malik's standoffish persona — believe it or not, some celebs are not as sociable as they make themselves out to be.

Check out our gallery above to see which stars say they find it difficult to be the center of attention.

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