It should be as hard or harder than your limits. It is designed to find your limits and try to push you to the edge of what you can endure (or cause you to quit). It is mentally and physically...
You can't really drop out. You have to make them not want you, and that's not to hard. Just openly defy them, walk away, or sit down when they are yelling at you. Urinate during formation. A week or...