I know its something I did

Hi there, this is a custom theme I built myself. I do not write PHP and only have a very basic working knowledge so I know my “older posts” link is not working because of something I did/or didn’t do. Here is the code on my index.php I would really like to get the older posts button working as of now it isn’t showing up in any way shape or form.

<div id="content1">
<div id="content">
<div class="posts_over">
          		<?php $my_query = new WP_Query('showposts=7'); while ($my_query->have_posts()) : $my_query->the_post(); $do_not_duplicate = $post->ID; ?>
						<div class="posts">
									<div class="date"><?php the_time('M d Y'); ?></div>
          				<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link: <?php the_title(); ?>"><?php the_title(); ?></a></h2>
                      <div class="post-content1">
          					  <?php
                      if ( has_post_thumbnail() ) {
                      	the_post_thumbnail();
                      }
                      ?>
                      <?php the_content('<div class="continue">Click to read the rest of the post »</div>'); ?>
                      <?php wp_link_pages(); ?>
              				</div>
         			</div>

<?php endwhile; ?>
			<div class="alignleft"><?php next_posts_link('&laquo; Older Entries') ?></div>
</div>
<?php get_sidebar(); ?>

The website is: https://www.grandmashousediy.com. Thank you so much guys I promise no one is any more sorry then me that I’m an idiot when it comes to PHP.