The first thing you, who asked this question, should do is to seek professional career advice. An advisor will properly consider your background and qualifications and suggest the most appropriate course of action for you. You should also consider what journalism is. It varies quite considerably, from newspapers and magazines to radio and television reporting. Now we're going to add a few words of wisdom of our own.
Experience is everything.
We came upon this very same Catch 22 situation ourselves when applying for jobs in journalism. You can't get experience before you get a job, yet you can't get a job without experience. There are two ways you can gain experience. One is to do as many work experience placements as you can manage, and to write for school, college and university newsletters, specialist magazines and local free papers. In short, for any media that will print your name next to an article.