If you were always writing in HTML you could add the following to your functions.php file:
remove_filter( 'the_content', 'wpautop' ); remove_filter( 'the_excerpt', 'wpautop' );
I do this for some of my own sites.
As it sounds like you want the option to turn this on or off you may want to try the wpautop control plugin - https://wordpress.org/plugins/wpautop-control/
This should let you turn it off on your posts while leaving it on for other users.