Then you obviously haven't raided Mythic prenerf, its not exactly skillfull but i'm 100% sure if you and a top tier raider had the same gear, class and spec he will pull 50% or more dps than you do.
PvE is based on dedication and teamwork, working trough times that guilds mostly disband due to stress and anger, however if you haven't raided in a hardcore endtier guild then you might not get the impression of how skilled you need to be.