Where should I post my story?

You can post it here or at the dragons spot

You can post things on fanpop obviously, either as an article or even start a forum if you are looking for help and opinions, but if you are writing fantasy based stories, you may want to consider joining Wyvern's Library at link

link
XD
It's a website for people who write stories!

here, of course!!

u could post it at your school or to the nearest book store