Where am I?

I was lucky to have a good seat in the shuttle this morning. I had a
place where I can rest my head so that I can catch up on sleep on my
way to work. So I plugged in my earphones and let the music lull me to
sleep.

After a few minutes, a girl in an exclusive girls' school uniform got
in and sat beside me. I blinked at her and went back to sleep. A few
minutes later, the door opened and I suddenly heard people giggling. I
opened my eyes and the two girls apparently know each other and they
started giggling and laughing. I thought it will just be a momentary
thing but they were giggling and laughing throughout the 30 minute
trip. The bad thing was, I could hear them through my earphones (and
my music was loud) and one of the girls was seating beside me and she
kept on jostling me whenever she would laugh or giggle. I wanted to
tell them to shut up and the "nice" side of me kept on telling me that
they are just girls. I then started to think when I was when I was
their age. I realized than I must've been laughing and giggling as
well if I saw an old friend. I must've been caught up with the
intricacies of life that I've forgotten what it feels to be carefree.
I suddenly felt so OLD!