There are many people who completly change their field of work in their 30s.
Not sure where exactly you are from but here in germany you already slightly choose your direction (which subjects are more important for your grades at the end of school) when you are ~16 and then you can go to university with around 18 yo where you choose what you actually wanna do.
Everything before that is honestly to young to expect children to already know what they wanna do in the future
School is 90% about developing working ethics anyways