Theory of gavity that just popped in my head

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Okay, so gravity effects big things right? and Quantum Mechanics effect small things. Big things like planets have gravity but small things like people dont, But planets also have quantum mechanics, so do people. What if the big things are so big that there quantum mechanics are so great that it is that giving off the gravity, this would then explain why the force of gravity is so week, because it is pretty much a fallout of alot of quantum mechanics.