Young people considering writing careers sometimes ask about the BFA>MFA track and I tell them, "No! Anything but that!" And mean it. Biology! Classics! Business! Please, please use your undergraduate years to learn something besides creative writing! I know a New Yorker short-story writer who graduated from the Colorado School of Mines. The story that made him famous is about cavemen.
In my experience the best possible background if teenagers can't wait to see themselves in print before they're really ready is journalism. Journalism school teaches how to observe and write about something besides yourself. You learn to write hard news, features and profiles, all requiring fantastically different strategies and skills. You practice doing research, interpreting statistics and trends, doing interviews. I hope J-school still teaches ethics and accountability. It pushes you out on the street and tells you not to come back until you get and write the story.
That happens to be my own background. There wasn't a BFA in creative writing so I wanted to be an English major. My parents wanted me to learn a trade so I went to J-school and owe it everything. I was taught to write clearly and be responsible for what I wrote. Also, ultimately my work serves others, whether it's information or entertainment. All those apply to creative writing. I lived on what I learned in J-school while getting my MFA. BFA doesn't mean you learned anything about writing. Journalism means that you did. And you know the famous names who were journalists before they were novelists: Dreiser, Hemingway, and so on.
BFA>MFA>(and, oh no!) Ph.D in Creative Writing . . .and you'll still have to hand over your writing sample to answer, "Can you write?"