It sounds like you have a fear of flying, which is manifesting as a desire for security. At least out of Israel, airport security doesn't really service much of a purpose other than 1) Stopping dumb people and 2) Giving the masses an illusion of security.
That doesn't mean there isn't security though, but it's behind the scenes. It's the intelligence agencies monitoring people they suspect. There's also changes to aircraft, such as locked flight deck doors and cameras watching them. The biggest change, however, is passenger vigilance. Try and do something stupid on an aircraft now and the entire plane will stop you.
There will be turbulence and other incidents that'll cause loss of altitude. Marshals and body scanners won't stop that. See if you can find yourself a Fear of Flying course. Many friends I know who suffered from this reported significant improvements, and have now started enjoying the world.