The song is asking for help
"can you lend me a hand" by a person who is struggling and wondering if life is worth living.
They are considering suicide.
The song is an affirmation of life though,
it refers to the fact that the questioner is still alive and there will be plenty of time to be dead.
Life is all we know and we only have a relatively short time to be alive - so we need to figure out how we each make that time meaningful.
It's a pretty cool message when you think about it.