You sound disappointed that the earth hasn't yet collided with the sun.
Applying random formulas to a physical situation is never a good idea. I suspect that the formula you are having issues with is for two bodies in space which are not in orbit around one another, as unfortunately the earth is with the sun.
When one body orbits another, the motion of the orbiting body is such that as it falls toward the central object, it moves laterally with respect to that object just enough to avoid colliding with it.
Isaac Newton dreamed up a thought experiment to explain how orbiting bodies do not collide with one another, only he used the earth and a hypothetical cannonball fired from the top of a tall mountain in his explanation, which is sometimes referred to as Newton's Cannonball: