(If it is possible, Please correct my mistakes)Teenagers and Job

I think it can be useful because it allows teenagers to try jobs and helps them prepare and learn how to earn money. We know earning money is necessary for living. But I would prefer people to be in jobs that are related with their field of study. It is more important due to the fact that people can focus and improve in a skill related to science, for instance.
I think some teenagers, when able to earn money, do not like to continue their education and tend to enter the adult life sooner which can be dangers for them, because they might get into some bad habits (using alcohol, drugs, etc.).
I prefer people who are studying not to work but if they do work, it should be related with their field of study and it should reflect their personality, talent, interests, abilities and so on.
Thanks for your attention.
Everyone can correct me. I am so grateful.