Not enough info. However, you can shift the viewport to a higher Y axis.
Simply by dragging your camera and objects to a higher Y axis.
In Computer Science, computers were built to render the screen from top -> bottom and left -> right, which naturally puts the view in any game engine to the 4th quadrant (-1,-1). Ideally most Developers want their 2D graphics to be in the 2nd axis (1,1).
Also I do not recommend making a new "y_inverse" variable because it's unnecessary. If you are using C# I would recommend that you use a Pointer variable instead.