Alone in a crowd...

Isolation... a glass box I view the world around me from. Although I can reach out and touch the person next to me, I feel as though I'm a million miles away.
You perceive me as distant, or aloof, or merely apathetic in general. It goes deeper than that, but the uninitiated can't fathom it.
If it were only a social problem, then a crowd around me could cure it, and snap out of existence the gulf between myself and everyone else. Everything else. However, I'm on the other side of a canyon that no one else can cross, no matter how determined they are.
I'm not waving, but drowning...