If you're losing
that much there's a good chance you're simply not up to the task, unlike a single player game, in an mmo you're not meant to be able to do everything with just subtle alterations in strategy. If you're failing a given task so many times you're probably missing something critical (healer/tank/sleep/bind/etc) that you're not gonna get around by just trying again with the same materiel and hoping for the best.
If you're failing so many times that it feels like the game is indeed giving you a "kick in the nuts" it's probably time to accept defeat, cut your losses, re-evaluate your strategy, and try again another day.