Then write as much as you can, for the high school newspaper or the magazine, to exercise your literary muscles. I think it's important in college to join the newspaper because that can be like a farm team for a major league baseball club. You'll learn the basics of your craft and meet people who can help you get jobs along the way. A good journalism school can provide the same opportunities. Then comes the climb up the professional ladder.
Most young reporters start out at small newspapers.
They get the experience and wiles and mentoring they need. Once they show their stuff, they graduate to larger and larger newspapers. The climb isn't easy, but almost no career ladder is. I hope none of what I've said intimidates you, and I wish you good luck. It's a little like asking a grandfather who among his 50 grandchildren is his favorite.