Are you using custom menus? Using a custom menu allows you to precisely control what appears in your menus.
It’s probably not possible to do this (at least I’ve never heard of anyone trying this, as pages are essential to all the WP sites I’ve seen). If you tell us why you need to do this, we can probably provide a solution to your actual problem.
If I gather what you are trying to do, ie, make the post not visible on the front end either in a menu, or if someone visits it directly, but still have it in the wordpress admin, just change the post status to draft.