You're reading BOTH of those. They are equal. If they weren't equal, then you would be accelerating up or down.
You're reading both your weight on Earth, and the Earth's weight on you.
You are weighing the force acted upon you. On earth, your weight is the pull of gravity on your mass. Your weight is not a constant. On individual planets or moons, however, the pull is the same when in the same place relative to the core.
When you weigh yourself on a scale, it reflects both your weight and the support force, which are equal under stable conditions. The scale reading changes with acceleration in an elevator, indicating a different balance of forces. In free fall, you feel weightless since there is no support force, even though gravity is still acting on you.
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