Miguel de cervantes spent his young adult life in the military, only becoming an accomplished later in his life. i need i looked up answers from other people and they said poet and author which is it

I assume poet would be a better answer than author 
 

Miguel de Cervantes was born near Madrid in 1547. He became a soldier in 1570 and was badly wounded in the Battle of Lepanto. Captured by the Turks in 1575, Cervantes spent five years in prison. before he was ransomed and returned home. After less successful earlier efforts, Cervantes finally achieved literary success in his later years, publishing the first part of Don Quixote in 1605. He died in 1616.

He feels that he way because