My Interest?

Feel that I should spend more time on my interest rather than wasting my time fooling around.. but what is my real interest? In a blink of an eye, I can already think of a few.. Singing? Playing piano? Photo shooting? Foreign language? Which one should I choose? I can't be learning all of them at the same time.. God.. Please help me to choose the best one.. Can't wait to get it started..

So, which one? :)