[Armin isn't sure how that's relevant. His heart is racing and color floods his cheeks as he realizes he's been babbling like a child. His body was not prepared for the rush of caffeine and sugar.] I'm fifteen.
Other options:
Re: I am a terrible human being sorry
[Armin isn't sure how that's relevant. His heart is racing and color floods his cheeks as he realizes he's been babbling like a child. His body was not prepared for the rush of caffeine and sugar.] I'm fifteen.