In which direction does earth's gravitation force act?

It is a linear force towards two centers of gravity: you and the earth. While the earth exerts a strong gravitational pull on you, you exert a gravitational force upon the earth, although it a much lesser force since you have far less mass than the earth. To go even further, the magnitude of the sum of forces would be 9.81m/s2 plus your body's gravitational acceleration, whatever that number may be. So let's say that the gravitational force that you exert is 0.001 m/s2, then the total magnitude would be 9.82m/s2. This was answered with credible source

Old Answer: Its NOT your face ser.