LineRenderer & EdgeCollider problem

So I'm making a Unity game, one of its features being the player being able to draw a straight line with the LineRenderer. I also need to implement an EdgeCollider to the line created since it'll need to detect collisions with another object in the scene.

However, when I run the game, the line draws in the right place but the edge collider goes way off the screen and is much bigger than the line itself. Here's an example:

Here's the code for line & edge collider, which is attached to the main camera (which is stationary):

 using UnityEngine;
 using System.Collections;
 
 public class LineHandler : MonoBehaviour {
 
     #region globals
     public Color c1 = Color.yellow; 
     public Color c2 = Color.red; // c1 and c2 set the color of the line
 
     private GameObject lineGO; // this game object holds the LineRenderer
     private LineRenderer lineRenderer; // LineRenderer instance
     private int i = 0; // integer used to store size and index of vertexes in the line
 
     private bool pcSet; // boolean used to confirm whether or not a bc is there
     PolygonCollider2D pc;
     Vector2 startPoint;
     #endregion
 
     #region methods
     void Start() // in this method we set up the necessary properties for the line
     {
         lineGO = new GameObject("Line"); // initialization of lineGO
         lineGO.AddComponent<LineRenderer>(); // we give lineGO the LineRenderer
         lineRenderer = lineGO.GetComponent<LineRenderer>(); // now lineRenderer knows what to refer to
         lineRenderer.material = new Material(Shader.Find("Mobile/Particles/Additive")); // material assignment
         lineRenderer.SetColors(c1, c2); // we set the start and end color of the line
         lineRenderer.SetWidth(0.1f, 0.1f); // we set the start and end width of the line 
         lineRenderer.SetVertexCount(0); // we set the number of points in the line, the more we set, the bigger the line can become
     }
 
     void Update() //the line is created here
     {
         if (Input.touchCount > 0) // the touchCount property returns the number of touches onscreen, so this block of code execs only if the screen is touched
         {
             Touch touch = Input.GetTouch(0); // the touch variable keeps a reference to the player's touch
 
             if(touch.phase == TouchPhase.Moved) // to move the line, the touch's phase needs to be Moved (Began/Moved/Stationary/Ended/Canceled)
             {
                 #region handleLine
                 if (i == 0) // we increase the max number of vertexes in the line to two (start & end)
                 {
                     lineRenderer.SetVertexCount(1); //at the very beginning though, the line must only have 1 vertex (a point)
                     startPoint = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
                 }
                 else
                 {
                     lineRenderer.SetVertexCount(2);
                 }
 
                 Vector3 mPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y,15); // mPosition is the position of the user's finger
                 lineRenderer.SetPosition(i, Camera.main.ScreenToWorldPoint(mPosition)); // i is the index of the point in question, mPosition is its position
 
                 if (i == 0)
                 {
                     i++; // the number of points increments only once
                 }
                 #endregion
 
                 #region handleCollider
                 if(!pcSet)
                 {
                     pc = lineGO.AddComponent<PolygonCollider2D>();
                     pcSet = true;
                 }
                 Vector2 endPoint = new Vector2(mPosition.x, mPosition.y);
                 Vector2 startPoint2 = new Vector2(startPoint.x,startPoint.y + 1);
                 Vector2 endPoint2 = new Vector2(endPoint.x,endPoint.y + 1);
                 pc.points = new Vector2[]{startPoint,endPoint,endPoint2,startPoint2};
                 #endregion
             }
 
             if(touch.phase == TouchPhase.Ended) // if the player removes his finger, this block executes
             {
                 #region destroyLine
                 lineRenderer.SetVertexCount(0); //deletes the block
                 i = 0; //reinitializes i
                 #endregion
 
                 #region destroyCollider
                 PolygonCollider2D[] lineColliders = lineGO.GetComponents<PolygonCollider2D>(); // creates an array with any Colliders in there
 
                 foreach(PolygonCollider2D p in lineColliders) //destroys all Colliders
                 {
                     Destroy(p);
                 }
 
                 pcSet = false; // like this i confirm that there is no collider
                 #endregion
             }
         }
     }
     #endregion
 }
 

I must also point out that for some reason the LineRenderer doesn't have a GetPosition, so I had to find a way to store the data from the start & end points of the lines.

Any advice on how to fix this? Thanks :D