Like I like the mediacal field, but I also am interested in the legal field.
Well you also want to consider what your strengths are. The medical field is science intensive, you're looking at upper level math courses (calculus, etc), more intensive chemistry classes (organic chemistry, biochemistry, etc), physics, biology... Depending on what exactly in the medical field you're looking to get trained in, you're looking at between 4-12 years of schooling and training. In law, you're looking at more of the social sciences (history, sociology, psychology, political science etc) and you need to be a good writer and have strong analytical skills. you're also looking at between 4-7 years of schooling.
Go and work in the medical and law industry for a holiday i.e. offer to make coffee and see what goes on behind the scenes. Then look at the jobs and travel opportunities each job offers. For example law should restrict you to one country, whereas medical won't. Then pick one and stick to it. You can always get a law degree for example and then study medicine after that. You don't have to only get one degree in your lifetime.
You could go to any college you're interested in and you could speak to a Career Counsellor who will help you find a career that best suits you :)
