Mailable.php line 382: [] operator not supported for strings

Hello,

I have a contact form, a contact mailable, and a contact mail view and a contact controller... in the contact controller I have the to email as a variable because I want to receive the emails and the from email will be the visitors of the page. However in the to method of the Mail class I got this error:

FatalThrowableError in Mailable.php line 382: [] operator not supported for strings

Here is the code

ContactController

<?php

namespace App\Http\Controllers\pages;

use Mail;
use Toastr;
use App\Mail\Contact;
use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Requests\ContactFormRequest;
use App\Http\Controllers\Controller;


class ContactController extends Controller
{
    public function store(ContactFormRequest $request)
    {
        $to = 'myemail@email.com';
        Toastr::success('Gracias por ponerse en contacto con nosotros'); 
        Mail::to($to)->send(new Contact($request->email, $request->subject, $request->message));
        return back();
    }
}

Contact Mailable

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;

class Contact extends Mailable
{
    use Queueable, SerializesModels;


    public $from;
    public $subject;
    public $message;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct($from, $subject, $message)
    {
        $this->from = $from;
        $this->subject = $subject;
        $this->message = $message;
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        return $this->from($this->from)
                    ->view('emails.contact');
    }
}

Contact View

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
</head>
<body>
  Buenas

  Ha recibidio un correo de: {{ $from }}
  Asunto: {{ $subject }}
  Mensaje: {{ $message }}  
</body>
</html>

ContactController

Contact Mailable

Contact View

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