Most choose to be reporters because it means they get to head towards crime and disaster and no-one questions it, like Superman and Spider-man. Their fields of work and study are extensions of who they are as a hero. Superman wouldn't be the same hero if he was a garbage-man by trade, for example.
Many are either/also scientists because it helps them in their heroic endeavours, like Barry Allen and Reed Richards.
And those that don't go in for science or reporting tends to have interests that in some way reflect their secret identity, and either helps them maintain it or just gives them a sense of purpose when not in costume.
Squirrel Girl could easily have been a veterinarian, who can talk to animals (or at least squirrels, who in turn can talk to other animals). Which would be insanely helpful in that field of study, and make it not seem as completely fucked up that she has a pet squirrel she brings everywhere. Or even a brilliant biologist, because these would make sense and also be out of the ordinary for a hot-shot hero.
But no, squirrel girl now likes "COMPUTERS!" because that is somehow relevant to her character.
Zero thought was put into it apart from "girls can computer too!". Much like nothing else in the comic was given any consideration whatsoever.