World of Warcraft-PvP best class?

Ok,so the title is just to get you attention, ok what i want to say is, I love Wow and enjoy on a regualry basis its just as it seems when i play pvp i get owned and end up del my characters(72 dk, 63 pally,55 hunter, 85 pally) and since then i know pvp is not for me but something keeps me drawing me towards it, i think its the only way to get good gear, also i try to proove myself wrong by making diff clases pvping with it getting owned , del and making a new one, any way i can overcome this?