I know that feel, Mahz. I have a black/white douchebag vampirism deck (not actual vampires, just tons of effects that steal life from the enemy to give it to me), consistently stomped the shit out of all the decks my friends and brothers had. Then I brought it to a tournament that it was legal in and I got my ass handed to me. Managed to win against one guy who seemed to be rocking an intro deck for the newest set with no modifications, but everyone else made me their bitch. I never did another non-standard tournament.