Object is not following the touch position

I have a problem – any suggestions? I knew, that there are many topics to this problem. But i can't figured out what's wrong. I want to move an object with touch. If i touch and move to left, the position of my object is not on the same place like my finger/touch. The touch position is not on the right place. Have anyone an idea how can i fix this?

// edit: Actually my code do nothing. I can’t move my object right now.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerTouch : MonoBehaviour
 {
 
 
     
     // Use this for initialization
     /*void Start ()
     {
     }*/
     
     // Update is called once per frame
     void Update () {
         if (Input.touchCount >= 1)
         {
             foreach(Touch touch in Input.touches)
             {
                 Ray ray = Camera.main.ScreenPointToRay(touch.position);
                 RaycastHit hit;
                 if(Physics.Raycast(ray, out hit, 100)){
                     transform.position = new Vector3(touch.position.x, transform.position.y, touch.position.y);
                 }
             }
         }
     }
 }