Do writers go to school to learn to write? How did they become writers?

Do they let the words pour out from their soul, or do they follow prescriptive rules, filtering thoughts and emotions through the sifter until it resembled something structured and safe, something acceptable to the authorities, whomever they were?

If you ever want to feel stifled or limited, take an arduous crash course on the principles of English grammar and you will be so confused and frustrated that in the end you will be too lost to know how to even start a sentence, let alone find a period or comma.