x0,y0 doesn't always point to the bottom left corner

I'm trying to keep the joystick in the bottom left corner but Screen.width*0.0f and Screen.height*0.0f points to the top left corner while Touch.position shows x==0,y==0 in the bottom left corner.. why? I switched the landscape mode around in case that was it but it didn't work.

It's very important both matches, so I can compare positions and know where exactly it was touched.

Here's my script: (Hopefully not too messy)

 using UnityEngine;
 using System.Collections;
 
 public class J1 : MonoBehaviour {
     public Texture2D[] JoystickImages=null;
         float MEM1,MEM2;
     Vector2 MEM3,MEM4;
     int JOYstandard=999;
     Vector2[] Sectionsa=new Vector2[5],Sectionsb=new Vector2[5];
     const float IncrementsMEM3=0.20f;
     float yValuea=0.99f,xValuea=0.00f,yValueb=0.80f,xValueb=0.20f;
     //    int HALFSIZE=75;//HALF OF 150 DRAWTEXTURE WIDTH HEIGHT
     // Use this for initialization
     void Start () {
     MEM1=JoystickRect.width;
         MEM2=JoystickRect.height;
             MEM3=new Vector2(JoystickRect.x+(MEM1*0.5f),JoystickRect.y+(MEM2*0.5f));
         for (int i=0;i<5;++i){
             Sectionsa[i]=new Vector2(MEM3.x+xValuea,MEM3.y*yValuea);
             Sectionsb[i]=new Vector2(MEM3.x+xValueb,MEM3.y*yValueb);
             yValuea=yValuea-IncrementsMEM3;
             yValueb=yValueb-IncrementsMEM3;
         }
         
     /*
         //COLUMN 1 ROWS                                 
         Col1Section1a=new Vector2(MEM3.x*0.00f,MEM3.y*0.99f);
         Col1Section1b=new Vector2(MEM3.x*0.20f,MEM3.y*0.80f);
         Col1Section2a=new Vector2(MEM3.x*0.00f,MEM3.y*0.79f);
         Col1Section2b=new Vector2(MEM3.x*0.20f,MEM3.y*0.60f);
         Col1Section3a=new Vector2(MEM3.x*0.00f,MEM3.y*0.59f);
         Col1Section3b=new Vector2(MEM3.x*0.20f,MEM3.y*0.40f);
         Col1Section4a=new Vector2(MEM3.x*0.00f,MEM3.y*0.39f);
         Col1Section4b=new Vector2(MEM3.x*0.20f,MEM3.y*0.20f);
         Col1Section5a=new Vector2(MEM3.x*0.00f,MEM3.y*0.19f);
         Col1Section5b=new Vector2(MEM3.x*0.20f,MEM3.y*0.00f);
         */
     }        /*
     
             Original (Touch)
     
             x*0.0f Left
             x*1.0f Right
             y*0.0f Bottom
             y*1.0f Top
             
             Next (Screen.width*0.0f,Screen.height*0.0f)
             
             x*0.0f Left
             x*1.0f Right
             y*1.0f Bottom
             y*0.0f Top
             */        
 
     void OnGUI(){
         
         GUI.DrawTexture(JoystickRect,JoystickImages[1],ScaleMode.StretchToFill,true,Screen.width/Screen.height);
     }
     Rect JoystickRect=new Rect(Screen.width*0.00f,Screen.height*0.00f,150,150);
     //Rect JoystickRect=new Rect(Screen.width*0.05f,Screen.height*0.7f,150,150);
 
     void Update () {
         foreach (Touch touch in Input.touches){
         if (touch.phase== TouchPhase.Moved||touch.phase==TouchPhase.Began){
                 float Deconstructor1=touch.position.x;
                 float Deconstructor2=touch.position.y;
                 for (int i=0;i<5;++i){
                     if (Deconstructor1>Sectionsa[i].x&&Deconstructor1<Sectionsb[i].x&&Deconstructor2>Sectionsa[i].y&&Deconstructor2<Sectionsb[i].y){
                         JOYstandard=i;}else{}
             }}}}}