You are efficient in whatever you do because you have no one to bug the devil out of you. It is no challenge to you to soar like an arrow by yourself. If you are given the task of taking care of someone else, however, your independent effectiveness will go to pieces, and in order to survive you will have to extend your selfish concern for yourself to include the one under your care. You must honor them regardless of what they do to you, and you must train your body, through your interaction with them, to feel at ease in the face of the most trying situations.
It is much easier to fare well under conditions of maximum stress than to be impeccable under normal circumstances, such as in the interplay with another under your care.
Further, then, you cannot under any circumstances get angry with them, because they are indeed your benefactor; only through them will you be capable of harnessing your selfishness.
You take care of them as a means of training yourself for the hardship of interaction with people. It is imperative that you internalize a mood of ease in the face of difficult social situations.