How to keep millis() at 0?

I'm making an Arduino reverse stopwatch..but Seems to have a problem with millis() function Whenever I upload the code on Arduino the millis starts running itself..how can I keep it at 0 until I call the millis. or any alternatives to solve it...

#include "SevSeg.h"
int button1 = 11;
int button2 = 12;
int button3 = 13;
int value = 10;
int  timer = 0;
bool n = true;

SevSeg Display;
void setup() {
 Serial.begin(9600);
 byte numDigits = 2;
 byte digitPins[] = {9,8};
 byte segmentPins[] = {10,2, 3, 4, 5, 6, 7,1};
 bool resistorsOnSegments = true;
 bool updateWithDelays = true;
 byte hardwareConfig = COMMON_ANODE;
 Display.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments);
 Display.setBrightness(100);


}

void loop() {
   Display.setNumber(value, 1);
   Display.refreshDisplay();
   
 if (digitalRead(11)==HIGH){
   Start(value);
 }  
}


void Start(int value){ 
 while(n){
   unsigned long timerGlobal = millis();
   Display.setNumber(value-timerGlobal/1000, 1);
   Display.refreshDisplay();
   if ((value-timerGlobal/1000) == 0){
     n = false;
   }
   
 }
 
}

This should work

//#include "SevSeg.h"
            int button1 = 11;
            int button2 = 12;
            int button3 = 13;
            int value = 10;
            int  timer = 0;
            bool n = true;

            //Added
            int currentTime = 0;
            long int t0 = 0;
            long int t1 = 0;

            //SevSeg Display;
            void setup() {
             Serial.begin(9600);
             byte numDigits = 2;
             byte digitPins[] = {9,8};
             byte segmentPins[] = {10,2, 3, 4, 5, 6, 7,1};
             bool resistorsOnSegments = true;
             bool updateWithDelays = true;
             //byte hardwareConfig = COMMON_ANODE;
             //Display.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments);
             //Display.setBrightness(100);
             


            }
            void loop() {
               //Display.setNumber(value, 1);
              // Display.refreshDisplay();
               
             if (digitalRead(11)==HIGH){
               Start(value);
             }  
            }


            void Start(int value){ 
             t0 = millis();
             while(n){
               t1 = millis();
               if(t1 > (1000+t0)){
                  //has passed 1 second
                  currentTime++;
                  if(value-currentTime == 0){
                n = false;
                  }
                
               }
               unsigned long timerGlobal = t1-t0;
               //Display.setNumber(value-timerGlobal/1000, 1);
               //Display.refreshDisplay();
               
               
             }
             
            }