I add that you should of course apply to study law if that is your preference, and the study of law is a thing worthy in itself, regardless of your career aims. If it is your aim to practise as a lawyer, it may be worth knowing that about half of the lawyers in the UK have degrees in subjects other than law. There is much to be said for studying at university a subject which you enjoy, because you may be more likely to do well if you like your subject.
There are relatively few careers in which having a specific degree is a requisite for entry to a job. Medicine, and professions related to medicine, are example of such careers, as are engineering and working in the technical end of the computer world. For the most part, possession of a degree in an academically rigorous subject can be a useful preparation for an interesting career in a variety of fields. People sometimes assume that, for example, studying Maths or English fits a person only to teach Maths or English at a school or university, but people with such degrees do a wide variety of jobs as well as teaching. In other words, those who wish to study Akkadian languages, or Geography, or Biology, or whatever, should feel free to do so even if they do not intend to get jobs directly related to those subjects.
One of the best things about university is that it gives you time to find out more about yourself, about the world, and about what you might like to do when you leave the academic environment (or, indeed, whether you wish to stay in that environment and make a career of it). Bear in mind also that we can all have more than one career if we wish, and if the dice roll for us.
I am a bazillion years old. My general advice to people in their late teens and early twenties is: don't be in a rush.