I really like your poem. It gets you to think about life and the time after our being here on Earth and not knowing what will happen tomorrow.

But isn't the whole point of not knowing? Because if we would know definitely what and when will something happen and who will miss us or not, then we wouldn't have time to enjoy our life right here and now. We would be preocupied with a thought about future.

So my advice is just live and enjoy every day as much as you can! And keep on writing, 'cause you are good at it.