Paginate Comments and Models in Laravel 5.5

I am trying to paginate comments section and cadmodels section...but nothing happened...Please tell me where i am wrong.

Here is a code for pagination..

   public function index()
    {
        $user_id = Auth::user()->id;
        $user = User::where('id',$user_id)->first();
        $user->load('cadmodels','comments.cadmodel')->paginate(5);

        $categories = Categories::all();
        return view('dashboard.index',['user'=>$user,'categories'=>$categories]);
    }

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