Wrong inputs from Analog Read

#include <Servo.h>  // Includes servo library
#define E1 10  // Enable Pin for motor 1
#define E2 11  // Enable Pin for motor 2
#define I1 8  // Control pin 1 for motor 1
#define I2 9  // Control pin 2 for motor 1
#define I3 4  // Control pin 1 for motor 2
#define I4 5  // Control pin 2 for motor 2
#define I5 3
#define I6 2
int servoPin = 7; 
int servoPin1 = 12;
// Create a servo object 
Servo Servo1;
Servo Servo2; 
void setup() {
  pinMode(I6, INPUT);
  pinMode(13, OUTPUT);
  Servo1.attach(servoPin); 
  Servo2.attach(servoPin1);
  pinMode(E1, OUTPUT);
  pinMode(E2, OUTPUT); 
  pinMode(I1, OUTPUT);
  pinMode(I2, OUTPUT);
  pinMode(I3, OUTPUT);
  pinMode(I4, OUTPUT);
  pinMode(I5, OUTPUT); 
  Serial.begin(9600);
}
void loop() {
  // read the input on analog pin 0 and 1:
  int voltage6 = digitalRead(2);
  int sensorValue3 = analogRead(A3);
  int sensorValue4 = analogRead(A2);
  int sensorValue1 = analogRead(A0);
  int sensorValue2 = analogRead(A1);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage1 = sensorValue1 * (5.0 / 1023.0);
  float voltage2 = sensorValue2 * (5.0 / 1023.0);
  float voltage3 = sensorValue3 * (5.0 / 1023.0);
  float voltage4 = sensorValue4 * (5.0 / 1023.0);
  //Check if the button is pressed
  if (voltage1==5.00 && digitalRead(3)==LOW)
  {
    Servo1.write(180);
    Servo2.write(180);

    delay(1000);

    Serial.begin(9600);

    analogWrite(E1, 255);  // Run in full speed
    analogWrite(E2, 255);  // Run in half speed

    do{ 
    digitalWrite(I1, HIGH);
    digitalWrite(I2, LOW);
    digitalWrite(I3, HIGH);
    digitalWrite(I4, LOW);
    int sensorValue5 = analogRead(A5);
    float voltage5 = sensorValue5  * (5.0 / 1023.0);
    Serial.println(voltage5);
    } while (analogRead(A5)!=5.00);
    delay(7000);

    digitalWrite(I1, LOW);
    digitalWrite(I2, LOW);
    digitalWrite(I3, LOW);
    digitalWrite(I4, LOW);

    delay(15000);
  
    digitalWrite(I1, LOW);
    digitalWrite(I2, HIGH);
    delay(2000);
    digitalWrite(I3, LOW);
    digitalWrite(I4, HIGH);

    delay(7000);

    digitalWrite(I1, LOW);
    digitalWrite(I2, LOW);
    digitalWrite(I3, LOW);
    digitalWrite(I4, LOW);

    Servo1.write(0);
    Servo2.write(0);
  }
  else if (voltage2==5.00 && digitalRead(3)==LOW)
  {
   Servo1.write(170);
   Servo2.write(170); 
  }
  else if (voltage3==5.00)
  {
   digitalWrite(I5, HIGH); 
  }
  else if (voltage4==5.00)
  {
    digitalWrite(I5, LOW);
  }
  else
  {
    digitalWrite(13, HIGH);
  }
}

I am getting wrong inputs from Analog port on my Arduino Uno. Even when it is nothing connected to that Analog input I am getting reads of voltage on serial monitor. What should I do?
Nothing connected and getting this:

Izrezak.PNG

It is going to read something even with nothing connected.

Yeah, But I am getting wrong voltage from input pin and I think My code is wrong, but I cant find any error. Can you find something?

But I am getting wrong voltage from input pin

How do you know it is wrong?