Correção de texto: Japanese language 日本語

I have tried to learn japanese language, the problem is so tough and it's not so important, i have learned already hiragana and katakana , I know all of these characters, but kanji is too more difficult, I was studying for two years but I wasn't understanding quite nothing, when I got to the college I gave up because i chose to keep studying english hard, here in Brazil there are many brazilians who are descendent from japanese and I have many friends who are and anybody knows japanese language either, here in brazil there are the most Japanese population outside japan, I just gave up because i wouldn't have time enough to pratice and perheps I'll forget everything if I learn.