Should i have a no resuscitation order or should i choose be hooked up to a heart of lung machine so i live?

my living will / advanced directives says i don't want an N G tube or any heart or lung machines even if i may be able to live a normal life . i don't want to be on life support or any kind of artificial stuff tubing or machines . i already went through that before and it was too painful . but at the same time i m still alive and as well as i am . so i should be happy .