If you're not sure about Law, don't do it. It is a HARD subject, and it's not something that is easy to pass if you don't have an interest or any motivation to do it. Of course, everyone's different and you may be able to push yourself and make it through but that's up to you to figure out.
As for university itself, there's always the option to take a gap year (which in your case, I would definitely recommend and wish that I had done too). It will give you time to figure out the career path you want, whether or not university is for you or if an apprenticeship/full time work is better or what subject you would want to pursue.