Pagination with WP_Query on wordpress template

<?php
    // paging variable
    $paged = (get_query_var('page')) ? get_query_var('page') : 1;
    // tag variable
    $flr_tag = get_field('posts_tag');
    // the arguments
    $args = array(
        'post_type'         =>  'post',
        'category_name'     =>  'show-highlights',
        'tag'               =>  $flr_tag, 
        'posts_per_page'    =>  5,
        'paged'             =>  $paged,
    ); 
    // assign arguments to new WP_Query
    $my_query = new WP_Query( $args );
    // start the loop
    while( $my_query->have_posts() ) :
           $my_query->the_post();
?>
    <div id="content-<?php the_ID(); ?>" class="entry-content clearfix">                    
        <h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
        <div class="post-header-meta">
            <?php if( is_multi_author() ) { ?>
                <span class="the-author"><a href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ) ); ?>" title="<?php echo get_the_author_meta( 'display_name' ); ?>"><?php echo the_author_meta( 'display_name' ); ?></a>&nbsp;&mdash;&nbsp;</span>
            <?php } // end if ?>
            <?php if( strlen( trim( get_the_title() ) ) == 0 ) { ?>
                <a href="<?php the_permalink(); ?>" rel="bookmark" title="<?php printf( esc_attr__( '%s', 'standard' ), the_title_attribute( 'echo=0' ) ); ?>"><span class="the-time updated"><?php the_time( get_option( 'date_format' ) ); ?></span></a>
            <?php } else { ?>
                <span class="the-time updated"><?php the_time( get_option( 'date_format' ) ); ?></span>
            <?php } // end if/else ?>
        </div><!-- /.post-header-meta -->
        <?php the_excerpt(); ?>
    </div>
<?php endwhile; ?>
<div class="pagenav">
    <div class="alignleft"><?php previous_posts_link('Previous') ?></div>
    <div class="alignright"><?php next_posts_link('Next') ?></div>
</div>
<?php wp_reset_postdata(); // fixes bug where below ACF fields wont display ?>