This is a short but heartbreaking poem. Here are some suggesstions:

"A life so soon taken
With so much life left to live
A life so tragically taken
They had so much to give"

I really like the rhyming here, short and simple, but having the four "so"s really throws it off and it ruins if for me. Maybe try replacing a few of the "so"s to something else. Just an opinion.

"A stupid mistake
And a life is gone
One little mistake
And it all went wrong"

Repeating "mistake" throws it off for me, and I don't find it that creative, maybe replace "mistake" with another word, because it just wasn't really orginal to me.

"You blame yourself
You think it�s all your fault
And no-one understands you
You not an adult"

Just delete that A thingy in the second line.
In the fourth line: "You" should be "Your".

"A loss for the world
Occurred today
We�ll miss this person
Everyday"

Again, just get rid of that A thingy in the third line. Otherwise this was pretty good, but I felt like you could have added more emotion and more creativity to this poem. Keep writing, always and forever....