Error with 2D Raycast

Hi,

I am trying to develop a shooting mechanism for a 2d platformer and have got to the point of raycasts. This is the code that I am currently using for the raycast:

 void Shoot() {
         RaycastHit2D hit = Physics2D.Raycast(new Vector2(firePoint.position.x, firePoint.position.y), new Vector2(Input.mousePosition.x, Input.mousePosition.y), range, notToHit);
         Debug.DrawLine(new Vector2(firePoint.position.x, firePoint.position.y), new Vector2(Input.mousePosition.x, Input.mousePosition.y) * 200);
 }

Range is a float and notToHit is a LayerMask. However, with this code, the Raycast goes off at random angles (see images, the yellow highlighted part is where my cursor was, the white line is the raycast).