What is Pain exactlly?

nobody told me what pain is,
is it just a word a person or monster would use,
there own word to be noticed,
no,
or is it the dividing part of your heart,
it doesn't seem like that,
people use it to get attention,
to be noticed,
I feel pain as my friends say things like an opening of a world of chaos,
they say I'm the chaos and destruction,
I see pain that inflicts my body but not other people,
we say "I had tons of pain the other day because. . ." as if it is just an opening of a boring story that you don't know how to say,
so. . . what is pain?

End