Wordpress - Exclude Current Post from Recent Posts Loop
This the post__not_in
arg should work dandy for you:
$args = array(
'numberposts' => 5,
'offset' => 0,
'category' => 7,
'post__not_in' => array( $post->ID )
);
$myposts2 = get_posts($args);
Add this to your $args
'post__not_in' => array( get_the_ID() )
This way you won't have to deal with getting the current post ID and will potentially avoid errors with getting your ID. The get_the_ID() function just get the ID for you so you don't have to deal with or do anything.