Creating a Wordpress plugin to automate my work, can't get it to work

I'm creating a wordpress plugin to automatically make a bunch of pages from a dataset I have that I'll covert to an array. Here's my code so far;

<?php
   /*
   Plugin Name: Create Pages Plugin
   Description: a plugin to create pages programatically
   Version: 1.0
   Author: DJ Khaled
   */
function myplugin_activate() {
    global $user_ID;
    $array22 = array(
        "example1" => "example-1",
        "examaple2" => "example-2"
    );
    foreach ($array22 as $key => $value) {
        if (is_admin()){
            $page_title = $key;
            $page_content = '<p>Hello World</p>';
            $page = array(
                'post_type' => 'page',
                'post_title' => $page_title,
                'post_content' => $page_content,
                'post_status' => 'publish',
                'post_author' => $user_ID,
                'post_name' => $value
            );
            wp_insert_post($page);
            }
        }
    }
register_activation_hook( __FILE__, 'myplugin_activate' );
?>

I'm unsure why these pages aren't created when I activate my plugin. Any help would be appreciated.

via Chebli Mohamed