Read good books. Your whole life long, good writing will be the raw material of your own good writing. Broaden your world. Jump at chances to learn about other people and places. Look for other opportunities as well.
Many schools have public service programs, class trips and exchange programs.
Take advantage of them. Your aim in college should be to continue learning about many things, but to develop a special area of expertise that you can use as a journalist. Many people find that the best thing to do is to major in a subject like political science, economics or education, all important coverage areas for newspapers, but to get their journalistic training by taking some journalism courses and working in newsrooms. A journalism degree, with no experience won't take you very far. Visit a college before you select it, and visit more than one.