2D Colliders not working

So I have the code to where the player is supposed to walking into the trigger of this object and it's supposed to bring up some gui text you can click on and answer, but Unity is not registering that the player is even colliding with the 2DBoxCollider. I need help because I'm at a stand still in my project and for the life of me I cannot figure this out, I have googled it and nothing works.

 using UnityEngine;
 using System.Collections;
 
 public class ProtatoTalk : MonoBehaviour {
     public string [] answerButton;
     public string [] Questions; 
     bool DisplayDialog = false; 
     bool HasTalkedTo = false;  
 
     void onGUI()
     {
         if (DisplayDialog && !HasTalkedTo)
         {
         GUILayout.BeginArea (new Rect (1, 1, 400, 400)); 
          
     
 
             GUILayout.Label(Questions[0]);
             if(GUILayout.Button (answerButton[0]))
             {
                 GUILayout.Label (Questions[1]);
                 HasTalkedTo = true; 
             }
 
             if(GUILayout.Button (answerButton[1]))
             {
                 GUILayout.Label (Questions[2]);
                 HasTalkedTo = true;
             }
 
     }
         GUILayout.Label (Questions[3]); 
         GUILayout.EndArea(); 
     }
     
     void OnTriggerStay2D()
     {
         Debug.Log ("Player is in Trigger"); 
         if(Input.GetMouseButtonDown(0))
             DisplayDialog = true; 
     }
 
     
         void OnTriggerExit2D()
     {
         DisplayDialog = false;
     }
 }