Peace, that's what I need

In Washington D.C. right now. So so tired... I was annoyed by so many things.
What's wrong with the weather? What's wrong with this science museum? What's wrong with my brother? What's wrong with the subway system? Nothing, nothing is wrong. They are just the way they are. The problem is in me, myself.
I almost lost my peace in my mind. Half of the day was quite good, which was the part driving from Atlantic City to Washington D.C. It was 3 and a half hours long, but it was not boring. I could sleep a little bit so that nap compensated for frequently being awaken during last night. Then I had some conversations about my major and my brother's future with my parents. Yes, everything went good until we arrive at Washington.
It was almost 2:30 in the afternoon. It was so so hot and humid. Our parents dropped my brother and me off near Smithsonian Institution so that we could enjoy the rest of afternoon. Then they went to our hotel to check in, since they have been to Washington many years ago. I decided to go to National Air and Space Museum first. I'm very willing to go to a place related to science such as Natural History museum or Science Museum. I was expecting something fabulous. Like the one in Chicago. That science museum in Chicago was the best among I've ever been. Then this national air and space museum was quite... shabby. There were a lot of explanations on the board. Not simple at all. Font was also too small. Nobody paid attention to the explanation.
Then Hirshhorn Museum. It's an art museum. I really liked the pictures and sculptures. I would say that I was happy until that moment. Then something happened. My brother lost his camera and I know why. He didn't walk around the museum with me, he just played Nintendo. Then we went outside, he noticed what he lost and it took a long hour to get it back from guard. I was waiting outside.. I tried very hard not to scold or be angry at his careless behavior. And I managed my feeling.
We walked a bit to subway station. It's a long way from capital hill to our hotel. I wanted to ask the officer how to get a 'plastic' fare card then my English got stucked in my head and wasn't as smooth as I intended. Then that officer got me a 'paper' fare card and told me that I have to go to metro office to get plastic one. So we walked from one end of subway station to the other end almost three times. Soooooooooo tired. Besides, my brother was complaining about my undecisive way to get a ticket. That murmuring came from fatigue, and I know that he wasn't actually complaining about me. Anyway we arrived at the metro office but the 'plastic' fare card was 5 dollars each. What? In Boston, Charlie card is FREE@!!!! Nonsense...
I didn't express my fatigue and anger outside. Instead, I was quiet during the whole evening and night, just doing computer stuff and reading Bible. Still I don't know how to deal with my anger. I just wish there would be someone whom I can call anytime and tell my story and get comfort.
God, please help me. Please calm me down. I know you are the one I have to ask for peace. Pleas, our Father. I'm just so fragile... Let me stay in calm. I don't want to ruin the last trip in US 2009. I don't want to repeat the same mistakes I made today. I don't want to get angry with my brother or my parents.
Please, deliver us from evil one....