I was in middle school. I live just outside of Los Angeles, so the attacks occurred just before 6AM here. My dad was watching television and he was flipping through channels at around 5:50AM and every channel showed the first tower. At first, he thought it was a segment about a movie, but after more than 2 channels were showing it, he figured out it was either an attack or a huge accident. He went upstairs, woke me up, and I was down. I sat down and a couple of minutes later, we saw the second plane.
My sister was a freshman at The George Washington University at the time (she had been there about 3 weeks) and since she didn't have Tuesday classes, she would use those days to go out and see Washington, D.C. My family was afraid that she had been visiting the Pentagon and so we tried calling her but the phones didn't work. However, we did get a call at around 7:40AM our time and said she was fine, but she was a little jittered since she could see the Pentagon from her dorm window. We proceeded to call her roommates' parents, one from Oklahoma, and the other from New York City. The latter roommate's father worked in the Trade Center and she was having trouble reaching him, but somehow, we got through to a landline in New Jersey and found out he was fine and relayed the message to my sister via e-mail.
I still had to go to school. I was late by about 5 minutes. The first 20 minutes of school was a reading period where all students read a book of their choice. During this time, the teacher would listen to NPR on the front speakers (it was the band room). He turned on and started hearing about the attacks for the first time and the whole class' collective jaws (at least for those who hadn't heard) hit the floor.
I remember one period, my history period, my teacher was out the entire time trying to call his sister's cell phone, since she was an American Airlines flight attendant who did transcontinental flights. Luckily, he found out that her flight was a BOS-SFO flight that left around the same time as the BOS-LAX flight that eventually hit the tower.