Who Am I ?

Who are we ? Who must I be?
An atom. A rocks' thorn. Another hopeless thought.
2 arms. 2 legs. 1 head. 10 fingers. 10 toes. 2 eyes. 1 lip.
Who am I ?
Not a woman or a man
Not an idiot nor brilliant
Not a villan or a hero
Not dying but neither living
Only a splinter on this sublunary world