Becoming a writer is not a 'career decision' like becoming a doctor or a policeman. You don't choose it so much as get chosen, and once you accept the fact that you're not fit for anything else, you have to be prepared to walk a long, hard road for the rest of your days.
The study of history is the best medicine for a sick mind; for in history you have a record of the infinite variety of human experience plainly set out for all to see; and in that record you can find yourself and your country both examples and warnings; fine things to take as models, base things rotten through and through, to avoid.