Nat is just your normal teenager. Except for the fact that he's a workaholic and a magician and very ambitious, yeah.
So the normal teenager thing means that he is instantaneously stupid.
There's the explanation, albeit a very messed up one.
I, the strangely frightening person, am not a normal teenager. Which means I won't get split personality disorder, though I might get something else like OCD. Going on this forum three times a day clearly explains that.