So many languages to learn...I am being greedy, aren't I?

Well aside my two native languages, I learnt English, Arabic, and Chinese back then in school. Sadly, I forgot so many things I've learnt because I was too lazy to keep it up. Now, since I've nothing else to do than being a uni student, I'm learning other languages such as German, Russian, and sometimes Chinese (because apparently I can't let go of Chinese words from my mind). I don't even know what I've been doing. People might think I've gone crazy for trying to do this at once LOL.