Inaccurate shooting script for gun

The bullet are likely inaccurate because you are creating them to the side of the camera but not adjusting the bullets to make sure they hit where the camera is looking. You can use a raycast to get the point the camera is looking at and the adjust the bullet so it travels towards that point.

 RaycastHit hit; // the output of the raycast
             
 //check to see if the camera is looking at anything, if it is get the exact point
 if(Physics.Raycast(Camera.main.transform.position, Camera.main.transform.forward, out hit)) {
     //rotates the bullet so it is pointing at the exact point the player is looking at
     shooted.transform.LookAt(hit.point);
 }
 

The bullet will still end up falling below the crosshair because of gravity but this, at least makes, the bullet initially accurate. You could also disable gravity for the bullets if you don't want them to fall as they travel.

This wasn't asked in the question but two other things that might cause problems in the future:

You are using Time.deltaTime instead of Time.fixedDeltaTime inside FixedUpdate so the cool down on firing might be much longer then you expect.

Instead of using AddForce, you might want to set the velocity of the bullet directly so you can know how fast the bullet moves.