It is not only reasonable but mentally healthy for you to direct your own life.
Some people retire and, because they can do whatever they want, begin a second career.
This time, they do what they love and, many times, become highly successful. While teaching is surely a noble profession, his greatest gifts to humanity were clearly to come from his acting talents. Fortunately, for those of us entertained by his talents, he followed his bliss and became an actor. Another example of the second career is the comedian Phyliss Diller. She was a cleaning lady until she was 37.