You're not the only one. I hope they weren't foreshadowing when Solas is commenting on Varric's book, like "So at the end, it turns out EVERYONE is someone else in disguise."
Meanwhile, back in Skyhold...
Quizzy: You guys, I'm really shaken up by the disappearance of Solas. How could be not be who he said he was?
Blackwall: Remember, I was not actually a Warden.
Quizzy: Yeah, thanks for the reminder. Why didn't I just execute you again?
Sera: Actually, I'm not Sera, I'm Andruil, bad-ass elven goddess, in a mortal meat suit.
Cassandra: I'm not actually a Seeker, I just had a crush on Lucius and wanted to get close to him. Before he turned evil, anyway. Jerk.
Cullen: I'm not actually a Templar, and pretending to be addicted to lyrium is exhausting. Really I'm a goatherd. Luckily commanding soldiers is sort of like herding goats, but with more headbutting.
Varric: I'm not actually a dwarf! I'm just a short human, and pretending to be a dwarf makes things a lot easier.
Iron Bull: I'm not actually a qunari. I am, in fact, a magically talking bull with an iron lung. But the ladies swoon when they hear "Ben-Hassrath."
Cole: I'm not actually real. You just think I am.
Dorian: I AM a Magister. For real. Even though I've been insisting that I'm not.
Vivienne: I'm not actually a mage, everyone is just too intimidated to notice.
Quizzy: Leliana, you're the spymaster. How does this keep happening?
Leliana: I'm not Leliana! I'm actually a demon that looks like her.
Josephine: Well I am who I say I am! Except...well...I actually am illiterate. Don't you ever wonder why all my papers are blank?
Quizzy: Well, this explains a lot.