First day in ICU

So today was my first day in the ICU and was just an ICU orientation with a lot of quizzing. Even with studying the drugs, dosages, waveforms, disease processes, lab values, charting, different ventilators and their settings, all the equipment, the policies and procedures, everything from first and second year of respiratory therapy school I learned one thing today. I don't know anything. Maybe I should become a nurse.