Not modern but if you want short and miserable then you can't beat the anglo-saxons - something like Deor or The Wanderer.
also not modern but this?
Chidiock Tichborne was a young man sentenced to be hung, drawn and quartered for his part in the Babington plot to assassinate Elizabeth I in 1586. The night before his execution, in the Tower, he wrote this poem:
ELEGY
My prime of youth is but a frost of cares,
My feast of joy is but a dish of pain,
My crop of corn is but a field of tares,
And all my good is but vain hope of gain;
The day is past, and yet I saw no sun,
And now I live, and now my life is done.
The spring is past, and yet it hath not sprung;
The fruit is dead, and yet the leaves be green,
My youth is gone and yet I am but young,
I saw the world and yet I was not seen;
My thread is cut and yet it is not spun,
And now I live, and now my life is done.
I sought my death and found it in my womb,
I looked for life and saw it was a shade,
I trod the earth and knew it was my tomb,
And now I die, and now I am but made;
My glass is full, and now my glass is run,
And now I live, and now my life is done.