Film idea/ plot summary.

My idea is a version of The Last Man On Earth.
It's about a male teenager, who suffers from schizophrenia so he see's himself as another person alongside him. This then means he thinks he isn't the last person on earth. And to the audience, it will seem as if there is two people. However, towards the end, one of them disappears leaving the other scared and confused.
The boy starts the panic and runs around looking for his other personality, only to be greeted by himself again confused.
The last shot is of the boy standing there, questioning himself as to what just happened.
This is when it sets in he is the last person on earth, and he had been imagining this person all along.

Plot overall:
In the year 2016, the world's population is down to 1 person. The trouble is, he see's someone else.
Througout the short film, Brian (1) wanders around with his best friend Brian. (2) He starts off on a field, laying down talking to Brian (2) about the day. They both get up, and wander into the streets finding a car they like. They ask if each other can drive, (But they can't) so they end up walking again. Suddenly Brian (2) goes missing, so Brian (1) gets confused and starts to panic. The longer Brian (2) is missing, the more scared Brian (1) gets on his own. Eventually Brian (2) turns up out of the blue and explains how Brian (1) is mentally ill, and is actually on his own in the world. With this information Brian (1) gradually get's more and more depressed resulting in him killing himself.