The Army likes to talk a lot about risks: risk mitigation, acceptable risk, risk aversion, risk management, etc. The thing is, as a junior officer, every day is just one big risk waiting to happen as you learn your job and how the Army works. With those risks comes failure. You will fail and people will notice it. If they did not tell you that at your commissioning source, I am truly sorry. Failure is a part of life, and, at some levels, you are expected to fail. The important thing is to use the experience to grow as both a person and a leader, rather than let it bog you down in thoughts of how maybe the Air Force would have been easier after all.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.