AddForce in look direction?

hey guys i have a problem with my add force i have a missile with a rigidbody on it and a camera look so i clould make it move in the direction i am looking but the missile rotates as i want but it keeps moving one direction and while i look at somthing it does not add force in that direction i testen multiple things but nu luck what is wrong here can annyone please help thanks

 rb.AddForce(transform.forward * thrust);

i tried also this

  rb.AddRelativeForce(transform.forward * thrust);
  rb.AddForce(transform.forward * thrust * Time.deltaTime);
  rb.GetComponent<Rigidbody>().AddForce(Vector3.forward * thrust, ForceMode.Impulse);