As a contrast, Superman and Batman didn’t grow up wanting to be heroes.
Diana’s upbringing on Themyscira guaranteed that she’d have the proper combat and weapons expertise to defend herself in battle.
Diana knows that she’s meant to use her abilities to help the world and trail blaze her own path.
Circumstances beyond their control, whether it was being born with special alien powers or seeing their parents killed in front of them, pushed them to travel down the heroic path, albeit with alternative approaches to taking on evil.