did i make the wrong decision

Perhaps think about whether there's any career paths you would like to pursue and pick a degree that will let you do that. Or maybe you want to make sure you're going for an in demand field because you don't like interviews, or a lucrative one because you want to be able to fund your passion, what ever it is. I've always been under the impression that the student loan deal only applies for the first degree, but I may be wrong. Also note that certain unis encourage switching during the first year, which is something you can ask about at the open days.

thanks for the advice. i’m already in uni studying politics. what do you mean when you say ‘or make sure you’re going for an in demand field because you don’t like interviews’.

It was just a random example of a possible motivation for choosing a certain career path. If the industry has a skill shortage than the interviews are a breeze, compared to competitive fields. It probably wouldn't matter to most people.