Mortifying. Simply Mortifying.

So I was walking home from school, singing to myself the way I usually do, when I hear something. So I turn around, and I see this kid. I know him kind of, because he lives in my neighborhood. He's like, in fifth grade, and he has this look on his face that says, "Um... You seem a little crazy..." Quite furious at myself, and rather mortified, I mutter "Shoot!" under my breath, and take off running. I still feel really stupid.