It’s too bad that you missed out, but it’s not as bad as it looks. That complete set of 5-star priest equipment at level 67 is nice, but you should be finding parts of the holy set, an even better 5-star set, at about the same time you are awarded the resurrection set.
There’s nothing awarded to you, as an apprentice, that you won’t be able to find on your own, just playing through the story.
I say this as a player who also has no master, because there were no masters when I passed 30th level. @Saladiman posted his master code here first, so he probably doesn’t have a master either.
So, if you’re happy playing the game, don’t worry about it. It is not a mistake that will haunt you forever. Trust me on that. In a month or two, you will have forgotten all about it.