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If you do not know why you did not take a career in sports or business, strangers on the internet also do not know.
There could be a lot of different reasons. The reason might be subconscious.
Some business people and some professional athletes, are more successful and some are less successful. that is true, in any industry.
Not everyone has the same potential, interests, skills, or situation. The best career for one person is not the best career for someone else.
In any event, it is physically impossible to change the past anyways. Thus, it does not matter why you did not take a career in sports or business.
You might be able to make a career change right now. Although some jobs are harder or impossible to get into, when you are older, than when you are younger.
You could look up Internet forums, from the professions that you want to work in, and ask questions, and see what it takes to be successful in that vocational field.