Turn with the mouse instead of with the camera

Im doing a third person shooter, Im using a modified version of the script that comes with unity but I dont know how to make it turn with the mouse movement instead of the camera. The movement with the camera is highly inpressise almost unplayable because the aiming (torso rotation) and the camera rotation are two different movements.

What I want to do is change the Orbit camera script Im using right now with another I have that follows the torso of the character and turn in the direccion of the character's torso. The torso its controlled with another script that rotates it with the mouse. You may think I could do that and just change the camera for the torso in the controller but I already tried that, when I do that the character starts to turn in circles everytime I press forward.

This is (I think)the relevant part of the controller script, I cant post it all, its way too long

 void  UpdateSmoothedMovementDirection (){
 
     Transform cameraTransform = Camera.main.transform; 
             
             //Camera.main.transform;
 
     bool grounded = IsGrounded();
 
     
 
     // Forward vector relative to the camera along the x-z plane    
 
     Vector3 forward= cameraTransform.TransformDirection(Vector3.forward);
 
     forward.y = 0;
 
     forward = forward.normalized;
 
  
 
     // Right vector relative to the camera
 
     // Always orthogonal to the forward vector
 
      Vector3 right= new Vector3(forward.z, 0, -forward.x);