How to make object follow touch position?Pls Help

I am trying to make my player follow my touch position only in the x axis. There is a constant force on the y axis(the player moving forward).i want to control the position on the x axis. pls help I found this code but the player only goes up. void Update () { if (Input.touchCount > 0) { // The screen has been touched so store the touch Touch touch = Input.GetTouch(0);

          if (touch.phase == TouchPhase.Stationary || touch.phase == TouchPhase.Moved) {
              // If the finger is on the screen, move the object smoothly to the touch position
              Vector3 touchPosition = Camera.main.ScreenToWorldPoint(new Vector3(touch.position.x, touch.position.y, 10));                
              transform.position = Vector3.Lerp(transform.position, touchPosition, Time.deltaTime);
          }
      }