What is right for me at university? a levelsWatch
Then look down these lists of degree subjects at Sussex - https://www.sussex.ac.uk/study/undergraduate/ - and read the descriptions of a wide range of courses, especially the ones that are not the same as the A level subjects you are doing, or you have never hard of. Many subjects have no specific A level subject requirements so lots of social science and humanities subjects are as possible for you as well as the more obvious subjects like Neuroscience, Psychology and Maths subjects.
And btw, going to Uni straight from school is not compulsory - if you need a gap year to think about things, then this is better than picking a course in a hurry and dropping out because it wasnt what you wanted.