block breaking code doesn't work the way I want

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class BlockBreaking : MonoBehaviour { public int hitsNeeded = 4; public int hitsTaken;

 private void Update()
 {
     if (Input.GetMouseButtonDown(0))
     {
         BlockBreak();
     }
 }


 void BlockBreak()
 {
     hitsTaken += 1; if (hitsTaken >= hitsNeeded) Destroy(gameObject);

 }

}

I need help with something you may have already noticed this code block breaking code I just want it to break with the mouse when I touch it only 1 block but they all break Even if I'm stuffed in the air