My biggest frustration - need advice

I am a kidney transplant patient. I'm in a CPR class and we had to do an exercise on giving breaths for as a fallen adult.

I tried to do the exercise and couldn't bend over far enough to do the exercise. My instructor was very nice and patient.

Me on the other hand got very frustrated. This incident brought me back to reality, It is certain things that I can and can't do.

Can you give me some advice on how to handle this situation? I know that in a real emergency I need to be prepared.