I am a lawyer and my brother is a doctor.
To be a doctor, you need a vocation. Only you can know if you have the vocation for medicine.
To be a lawyer, you don't need either a vocation or a law degree, but you do need an analytical brain, an eye for detail, an appetite for very hard work, good written English, a large measure of self belief, mental and physical resilience, and good people skills.
I suggest that you study a subject which interests you in its own right, and which you are most likely to do well in. If that's law, fine. If not, you can study law after your degree.