You'll want to "learn" Journalism. I put 'learn' in quotations because there are three ways that I know of personally that you can go about this:
1. Earn an education/Degree in Journalism by taking classes at your current school and continue on at a University.
2. Orrrrr...you can contact any applicable News/Journalism service/agency personally through a telephone call, e-mail, or letter, and let the editor or Producer (in the case of Television) know that: 'Hey...this is what I WANT to do with my life and I WANT to do it for the rest of my life. I am asking your permission to LEARN from you and would be willing to WORK my way up.' And let that person know that you'd be willing to do so through an INTERNSHIP basis.
3. Orrrr...DO BOTH. If you go to University seeking a Degree in Journalism, you'll probably be required to take an INTERNSHIP class anyway. And if you go through Journalism courses at a University you stand a better chance to "get a foot in the door" as an INTERN.