Gravity is pulling you downwards with a force called weight, but the equal and opposite force of the floor pushing you upwards balances it out, resulting in no net force and no acceleration.
According to Newton's Third Law of Motion, gravity pulls you downwards with a force called weight.
However, you do not accelerate downwards because there is an equal and opposite force provided by the floor, pushing you upwards.
This force of the floor is called the normal force.
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction.
In this case, the action is the force of gravity pulling you downwards, and the reaction is the normal force pushing you upwards.
These two forces cancel each other out, resulting in no net force and no acceleration.
So, the reason why you are not accelerating downwards is because the equal and opposite force of the floor pushing you upwards balances out the force of gravity, as described by Newton's Third Law of Motion.