Riddle competition!

If you're good at puzzles and riddles, now is your chance to use your skill! Whoever privatly messages me the correct answer first will win coordinator and 5 cheers. Good luck! 🍀🤞

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"I can build a castle, I can tear one down. I can make you wear a smile, Or leave you with a frown.

I’m lighter than a feather, But can crush you like a stone. I’m shared by many people, Yet felt when you’re alone.

What am I?"