Pretty cool!
Don't mind the fact that you haven't taken a class, I think that self-thought people are much cooler than others (lol so am I).
Besides that, I loved every minute of it. Brilliant character designs, just enough ambiguity to make them memorable, and very nice animation with the use of fills and gradients.
Storywise, awesome too. The bullies were cruel, and the poor pathetic younger kid classic, but the way it was portrayed was nice. Of course, the supernatural part was expected, but the fact that you changed the end to psychological warfare; simply awesome. not to mention the bullies themselves had pretty cool and unique characteristics.
Music wasn't bad either, not much stuff to 'notice' but they did cut out at odd moments though. I think its better to let the music die down to 0, instead of cutting out instantly and leaving an awkward silence, unless that's what you want it to do.
And btw, great use of Rayman in the opening btw. ;P
And TheNewslcon, the main char is naked to show the youth and frailness of his character, like a baby. Though that example may seem kind of sick...