I'm getting really unstable analog values with my B103348 joystick

Question

I'm trying to make my B103348 joystick control a DC motor but I'm getting very unstable values from it specifically when the y axis is at 0. This is what my Serial monitor shows...

0, 21, 21, 21, 0, 22, 23, 21, 21...

This is the wiring...

And here's the code...

int y_pin = A0;
int y_val;
int in_1 = 3;
int in_2 = 4;
int clock_wise_speed;
int counter_clock_wise_speed;
int en = 2;
int dt = 500;
void setup() {
pinMode(y_pin, INPUT);
pinMode(en, OUTPUT);
pinMode(in_1, OUTPUT);
pinMode(in_2, OUTPUT);
Serial.begin(2000000);
}
void loop() {
  //Clock wise = in_1 LOW and in_2 HIGH.
  //Counter clock wise = in_1 HIGH and in_2 LOW.
  y_val = analogRead(y_pin);
  clock_wise_speed = .21994 * y_val;
  counter_clock_wise_speed = 90;
if(y_val >= 506){
    analogWrite(en, clock_wise_speed);
    digitalWrite(in_1, LOW);
    digitalWrite(in_2, HIGH);
  }
if(y_val >= 501 and y_val <= 505){
    digitalWrite(en, LOW);
  }
if(y_val <= 500){
    analogWrite(en, 225);
    digitalWrite(in_1, HIGH);
    digitalWrite(in_2, LOW);
  }
Serial.println(y_val);
delay(dt);
}

Thanks in advance.