Uptight song meaning

This is a story of a man who seems to have no remains of hope left in his heart. He describes his life as a dead-end road with no goals or dreams; everything he does is doomed to be a disappointment right from the start - "got a new start on a dead-end road", "peaked out on reaching new lows". He drowned himself in melancholic apathy - "the future just ain't what it used to be". And now nothing in his life seems to be worth living for, and he's ready to use the most permanent solution to his problems - "suicide's last call". "Uptight, I'm a nag with a gun" - he wants to end it all for good.