I feel the exact same way. I wear a pair of noise canceling headphones and listen to music so I can block out all of the noise produced by other people. What I found a few days ago, however, was that I had a very, very difficult time concentrating and focusing when I wasn't wearing them or listening to music, where as a year ago that problem was nonexistent. I feel like the only time I can truly concentrate and be at peace anymore is late at night, when everyone else is asleep.