I am so excited! Going to Europe...next year.?

How do I contain my excitement? I'm going to France, Monaco, and Italy. I'm 16 now, I'll be 17 when I go. We are going to Marseilles, Avignon, Arles, Nimes, Orange, Nice, Monaco, Cinque Terra area, Tuscany, Florence, Rome, and Vatican City. We will be seeing lots of art at the Uffizi, Accademia Gallery and Vatican, plus a few other museums, which I can appreciate. I've been taking Art History classes since freshman year, and I've learned about so many of the artists and artwork I'll be seeing. I'm going a year from now, but I'm already so excited! I want to be excited, but not over the top, going crazy for a year excited. Any tips to get ready, what to buy, etc? How do I not freak for the next year leading up to my trip?