I don't know what to do at University anymore!

I've just finished my AS year and my teachers are expecting us to have written a first draft of our personal statement by September. Trouble is, I'm not really sure what I want to study anymore. I've always had Law or Psychology in my head and I've been dead set on Law for some time, but I'm beginning to doubt myself and whether it's the career for me? I've wanted to be a lawyer for a while but after researching further into it, doubt has been looming in my head. I really love Psychology and I think it's such a fascinating subject, but I'm afraid of the career prospects of this degree because I'm not particularly interested in working in an environment surrounding mental health! I did Biology, Chemistry, Psychology and ICT at AS. Other options are Optometry which is very competitive and Biology, which I'm not that keen on taking to degree level. If I could get some advice that would be great!