Take a look at where a Law degree might lead you:
http://www.prospects....s_law_job_options.htm
Then look at what a Media degree might lead to:
http://www.prospects....ation_job_options.htm
Decide where you REALLY want to go in life and, just as importantly, what you REALLY think that you'll ENJOY studying. A degree course lasts (at least) 3 years, at a time in your life when you should be having FUN. (There are dozens of reasons going to Uni but the number one reason should be to enjoy it. Do you want to spend 3 years of your life studying some very dry academic texts, alongside other people who enjoy that sort of thing, or do you want greater freedom of expression? BTW, I'm not knocking the more rigidly academic subjects with that question - My own degree is in Maths!)
Actually, while I've asked the question, I think that you've already answered it. Spending 3 years of your life doing something which is unrelated to to your greatest passion, and for which you believe you have the greatest flare, would seem to be absolute madness to me. Opt for the Media course! ;-)
Chris