A Prejudiced Skyline

Today...was a hard day. I hate admitting that I am homesick, or even the action of being homesick. But the feeling of being homesick isn't what I expected. I thought it was just the missing of family and friends, wishing you could talk to them, help them, BE with them. But, that isn't it. While the desire of loved ones by my side is a constant feeling, it cannot describe...what I am. Maybe that is the definition of being human, having indescribable emotions. True, no one said this would be easy.
I mostly just didn't want to go to school today, maybe that's it. I barely understand anything and today and yesterday consist of the classes that rely on language the most: Italian, Philosophy, Physics, Chemistry, and Biology. Math isn't too hard, English is just a little embarrassing, and my other classes I only have once a week. But Physics nearly pushed me over the edge. We had to make graphs for an experiment we did with a pendulum, counting the time it took to swing back and forth 10 times. So, I worked on my graph with a girlfriend in my class yesterday, we compared data and ended up with the exact same graph. I put emphasis on this because it is the whole point of this event. My last 2 hours of today were Physics, and my teacher starts his class my walking around the room, looking at everyones data. By now, all my professors know that I am an American and don't speak or understand Italian all that well. I think the dictionary sitting in the corner of my deck tipped them off if nothing else did. But, anyways, he comes to my desk and I sit with the two girls in my class, one of them being the girl I worked on the assignment with. He picks up her graph and smiles, says 'bellisimo', 'come un skyline' (beautiful, looks like a city skyline). Then he comes to my desk, and asks me why there is a gap in between two of the numbers on the x axis. I say in Italian, 'because there wasn't a set of numbers there, in the data'. He sighs, he tells me, in broken english, that all the intervals in the graph need to be the same. 'OK...' I say, 'They are, this interval is one'. He just scribbles out my numbers in pen on my pretty graph, and tells me to pay more attention to his class.
He walks away, I am stunned. I look back at my friends graph, I compare again, maybe I did make a mistake. But, then the embarrassment and the anger comes, they are exactly the same. Same intervals, same everything, I look at the rest of my classmates too. All the graphs are the same, all of them are approved by the teacher. He had already assumed I was wrong, he didn't like my graph....what a stupid American. How many forces can work against one person, how may obstacles can be in my way? What do I do now?