Building a foundation for Law at 16?

I am currently 16 and have for quite some time been intrigued by Law. At first it was just gonna be a backup career (which I know sounds insane) but now I'm really leaning into it. Problem is I think I've decided too late to be a lawyer, I haven't studied any stem subjects and have mainly focused on subjects like Literature and English which I got fairly good marks on so I think I'll be fine. I really want to pursue law, not just for the fun of it but I've always felt a certain passion towards it. Shows like SUITS and Law and Order SVU made me realize that 😅. Anyway I want to work in Civil rights law (I want to help victims of discrimination, abuse, and sexual violence, especially after living among victims of these crimes) and my question is, how do I get started? How do I build a foundation and go about it? Ive done my O Levels and want to do LNATs while doing a lvls history, literature and law. Thank youuu!! Oh also is there anything you would advise against what I'm doing?