Camera moves impossibly fast, and can't see any object

When the Player is a child of the camera, the camera sees the player, but moves impossibly fast. When the Player isn't a child of the camera, It doesn't get seen by the camera when built.

Camera script:

 using UnityEngine;
 public class PlayerCam : MonoBehaviour
 {
     public GameObject player;
     void Update()
     {
         gameObject.transform.position = player.transform.position;
     }
 }

(Unity 2020.3.30f1)

Sorry I don't have more info, I'm just really confused.