Gravity is an attractive force between two objects. The larger the objects are, the stronger the attraction is. Since the earth is so large, it strongly attracts everything that is near it, including you! You are actually being attracted to the center of the earth, but since you can’t pass through the earth itself to reach the center, you remain on the ground. When you fall, you are really just moving a little closer to the center of the earth, pulled by the attraction of gravity.