Nowadays, you don't have to sign up for a college course or even really leave your house to learn a new language. There are plenty of online resources to help you learn Japanese, such as Duolingo or Rosetta Stone. Many are free, or have a free trial to get you started before you make a full commitment to paying. As with learning any new skill, you have to practice consistently and intentionally in order to see full results. As well, you must also be patient, fluency doesn't come overnight, unlike some of their advertisements might lead you to believe.