Joyce E.A. Russell :
Great that you are asking yourself these questions. Keep in mind that you have plenty of time before you really have to make a "for real" decision. Generally, there are plenty of required core classes you need to take to graduate (regardless of major) that you can spend the first few years doing. Then, you can go after your major.
What I would encourage you to do is to meet with lawyers, artists, and any others you think might be in possible careers for you. You can meet face to face, over email, phone, etc and ask them questions about what they do in their jobs, what they like, dislike, how they got into the job, what would they do differently, etc. This is really important because it will give you a sense of what is involved in those jobs. I would make sure to ask several people in each field, don't just rely on what one lawyer or one artist tells you.
You could also have a career counselor give you some assessments such as Strong Interest Inventory, Career Leader, MBTI, to see what fields best suit you. This will give you some better ideas for other career fields to think about.
Good luck with this. Remember too, that you may end up having multiple careers in your lifetime so whatever you do initially will not be the only thing you will ever do. Don't be too hard on yourself to "have to pick the exact right thing right away".