Literally Peter in Homecoming, with Tony having to come in and fix his mistakes. She’s a high schooler. Maybe set your standards a bit lower for a literal child compared to the Avengers. Not to mention, every single superhero had a flaw in the beginning that they had to overcome in order to become a proper superhero. Tony was a narcissistic douchebag. Steve was too loyal and unquestioning of the system. Natasha was a literal assassin. etc etc None of these equals superhero. And all of these characters managed to overcome their faults and become truly heroic.