Dare ga nihonjin desu ka?
Watashi ha denemakujin desu, demo nihongo wo benkyoshímasu.
Tetsudate kudasai
Doumo arigatou gozaimasu~

go learn in high school


or college


or take some sort of class


dont EVER take language courses like on youtube, or Rosetta Stone


that = bulllshit and waste of time

すごいあなたはおたくです。
Start by decoding this sentence.

I agree with your intention of seeking formal classes, and I respect it, however I completely disagree with you on your opinion of Rosetta Stone. It's, by far, the top language learning software available today.

Call me crazy, but I doubt NASA(along with countless other companies) would use it if it weren't the best .