I applaud the storyline, it's pretty good so far, but if you're writing a story, it should be a bit more descriptive, add some more dialogue and vivid details. By doing that, the chapters wouldn't be so short. Instead of saying something like, "Tell us," Rainbow Dash said, you could say something like, "Tell us!," Rainbow demanded. You don't always have to refer to them as Rainbow Dash or Pinkie Pie. You could call them Rainbow, Dash, or Pinkie. If you add some descriptive words that give it some "oomph", it could make the story much more awesome!
Also, (although people already pointed this out) you might want to go back and fix a few grammar and capitalization errors. The word "Canterlot" is a word I see that isn't capitalized very much.
One more thing. The title of your story says "Bye celstia." (It bothers me a bit)
I hope you didn't take this criticism offensively, I just wanted to point out some stuff.