simply loop through posts

Because you’re on a page, that’s only going to display the query for that page. As such, you’d have to create a new query to bring in the posts you want. Replace your loop with this:

<?php
    $args = array(
        'post_type' => 'post'
    );

    $post_query = new WP_Query($args);

    if($post_query->have_posts() ) {
        while($post_query->have_posts() ) {
            $post_query->the_post();
            ?>
            <h2><?php the_title(); ?></h2>
            <?php
            }
        }
?>

Here some more information on the query: http://codex.wordpress.org/Class_Reference/WP_Query