I can't rotate and move in the opposite direction with character Controller

Hello all! I have a problem rotating a object with character controller. I have a object with the follow script. If I use raycast and i hit a wall, then the obect face in the opposite direction, due de Rotate, but when i do this my position still relative to the world, so, i turn 180º, but with the same direction. I mean... im "walking" backwards.

 using UnityEngine;
 
 public class RayCastForward : MonoBehaviour
 {
     bool hit;
     int speed = 5;
     CharacterController characterController;
     private void Awake()
     { 
         characterController = GetComponent<CharacterController>();
       
     }
     void Update()
     {
         hit = Physics.Raycast(transform.position, transform.forward,2);
         if (hit)
         {
 
             Debug.Log("HIT!!!!!!!!!");
             characterController.transform.Rotate(0, 180, 0);
           
         }
             characterController.Move(new Vector3(0, 0, speed * Time.deltaTime));
       
 
     }
 }

Thanks in advance!