My advise was also already given on here. Go to med school to be a doc, make all the money, and do cars as a hobby. Only become a doc if thats what u want to do though. Go talk to some ppl in the field that your parents want you to be in and the field you want to be in to try and get a closer look at what its really like, that might help. But whatever you choose i hope your parents support you with your decission. Good luck