Okay, first of all. You're taking the word of a sheltered president's daughter about Merlin's identity instead of getting it from the source. A sheltered president's daughter, I remind you, that had only begun her character arc at that point. A character arc that resulted in becoming more worldly and ultimately accepting of the ones trying to protect her.
Second, your original claim was that Merlin admitted it herself that she was just a pervert. You said and I quote "merlin stated from the start that he was a just pervert that enjoyed the moment and liked to disguises for fun". That's not what you provided to support that claim. Merlin said no such thing at any point.
Third I see no reason to doubt Merlin's explanation of her identity. Which has nothing to do with being a "pervert" or any other such pejorative. It's about accepting who she is in the moment without thinking about it too hard. Which is a great thematic counterpoint to the antagonist's outlook on identity. Both are approaching it with a degree of nihilism but Merlin's is a more positive, less destructive version.