How can I Make my orbit camera more smooth?

I have this camera script that orbits when I press the right mouse button but its all jerky how can I smooth its movement? also it seems it remembers where it was last time I pressed the right mouse but obviously first time player press right mouse button the camera is pointing to the ground, I dont quite like that >_<

 public class CameraScript : MonoBehaviour {
     //camera variables
     public Transform cameraLookAtTaret = null;
     private int mouseDown;
     private GameObject MiTarget = null;
     private float height = 0.0f;
     private float rotationDamping = 3.0f;
     private float heightDamping = 2.0f;
     private float distance = 2.0f;
     private float yMinLimit = -20;
     private float yMaxLimit = 80;
     private float xMinLimit = -100;
     private float xMaxLimit = 100;
     private float xSpped = 250;
     private float ySpeed = 120;
     private float x = 0.0f;
     private float y = 0.0f;
     private float distanceMin = 1f;
     private float distanceMax = 4f;
     
     /// <summary>
     /// Here is where all the mouse input takes place, if you hold now mouse button down it will just follow your character and zoom in and out
     /// if you hold down the right mouse button you can rotate around your player and zoom in and out
     /// if you hold both left and right mouse button it will also turn your player
     /// </summary>
     void Start(){
         MiTarget= GameObject.FindGameObjectWithTag("Target");
         if (MiTarget != null){
         cameraLookAtTaret = MiTarget.transform;
         }
         var angles = gameObject.transform.eulerAngles;
         x = angles.x;
         y = angles.y;
     }
     float ClampAngle(float angle, float min, float max)
     {
         if (angle < -360)
             angle += 360;
         if (angle > 360)
             angle -= 360;
         return Mathf.Clamp(angle, min, max);
     }
     void LateUpdate(){
         if (cameraLookAtTaret != null){
             var wantedRotationAngle = cameraLookAtTaret.eulerAngles.y;
             var wantedHeight = cameraLookAtTaret.position.y + height;
             var currentRotationAngle = gameObject.transform.eulerAngles.y;
             var currentHeight = gameObject.transform.position.y;
             currentRotationAngle = Mathf.LerpAngle(currentRotationAngle, wantedRotationAngle, rotationDamping * Time.deltaTime);
             currentHeight = Mathf.Lerp(currentHeight, wantedHeight, heightDamping * Time.deltaTime);
             var currentRotation = Quaternion.Euler(0, currentRotationAngle, 0);
             gameObject.transform.position = cameraLookAtTaret.position;
             gameObject.transform.position -= currentRotation * Vector3.forward * distance;
             
             gameObject.transform.position = new Vector3(gameObject.transform.position.x, currentHeight, gameObject.transform.position.z);
             
             gameObject.transform.LookAt(cameraLookAtTaret);
         }
         if (Input.GetMouseButton(1))
         {
             x += Input.GetAxis("Mouse X") * xSpped * 0.02f;
             y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
             
             y = ClampAngle(y, yMinLimit, yMaxLimit);
             x = ClampAngle(x, xMinLimit, xMaxLimit);
             var rotation = Quaternion.Euler(y, x, 0);
             
             var currentRotationAngle = gameObject.transform.eulerAngles.y;
             var currentRotation = Quaternion.Euler(0, currentRotationAngle, 0);
             
             gameObject.transform.position = cameraLookAtTaret.position;
             gameObject.transform.position -= currentRotation * Vector3.forward * distance;
             
             var currentHeight = gameObject.transform.position.y;
             gameObject.transform.position = new Vector3(gameObject.transform.position.x, currentHeight, gameObject.transform.position.z);
             
             gameObject.transform.rotation = rotation;
             distance = Mathf.Clamp(distance - Input.GetAxis("Mouse ScrollWheel")*5, distanceMin, distanceMax);
         }
     }
 }

I didn't make the original and there are things I still dont understand, but I have modify quite a bit of it.