Why do I have to?

This saturday, I'm going to have to perform a flute piece, lullaby by Johannes Brahms, at a place called Den Haag. Nervous breakdown is already striking me. Did not think I'm poised (vocab word of the week) and ready enough to perform there. I guess I've been fooling around too much the last few months. Tomorrow is the last day to practice my piece and I will promise to practice till I run out of every bits of oxygen in my body. I'm just joking. Anyway, wish me luck and joy for my very first flute performance!