Laravel 5 Connection refused - php

Question

I am new to Laravel and I can't seem to connect to the database. Here's my configuration
Mac OSX El Capitan
MAMP Pro
I always get the error SQLSTATE[HY000] [2002] Connection refused.
I have my_users table in the database application. By the way I am following this tutorial in youtube. Link here
.env
APP_ENV=local
APP_DEBUG=true
APP_KEY=LVwc8N06OepmCfptIcATzNxN2pkYJJwf
DB_HOST=localhost
DB_DATABASE=application
DB_USERNAME=root
DB_PASSWORD=root
CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync
REDIS_HOST=localhost
REDIS_PASSWORD=null
REDIS_PORT=6379
MAIL_DRIVER=smtp
MAIL_HOST=mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null
MAIL_ENCRYPTION=null
my_users.php (Model)
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class my_users extends Model
{
//
}
routes.php
<?php
use App\my_users;
Route::get('/', function () {
$users = my_users::all();
});
database.php
return [
'fetch' => PDO::FETCH_CLASS,
'default' => env('DB_CONNECTION', 'mysql'),
'connections' => [
'sqlite' => [
'driver' => 'sqlite',
'database' => database_path('database.sqlite'),
'prefix' => '',
],
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', 'localhost'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
],
'pgsql' => [
'driver' => 'pgsql',
'host' => env('DB_HOST', 'localhost'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''),
'charset' => 'utf8',
'prefix' => '',
'schema' => 'public',
],
'sqlsrv' => [
'driver' => 'sqlsrv',
'host' => env('DB_HOST', 'localhost'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''),
'charset' => 'utf8',
'prefix' => '',
],
],
'migrations' => 'migrations',
'redis' => [
'cluster' => false,
'default' => [
'host' => env('REDIS_HOST', 'localhost'),
'password' => env('REDIS_PASSWORD', null),
'port' => env('REDIS_PORT', 6379),
'database' => 0,
],
],
];