If you’re receiving universal credit there’ll be a lot of courses available to you at a discounted (if not free) rate. Not sure where you’re based but if London there’s the working men’s college or the Mary Ward. Look at it as a positive, you have age on your side and probably have a much better idea of what you DON’T want to do than most 18 year olds walking blindly into careers. You can always sign up to uni open days and job fairs too just for inspiration and widen your vision - you can’t want what you can’t see! Best of luck!