I am a junior in high school and I am interested in going into criminal justice and law?

I am interested in majoring in criminal justice with a minor in psychology. I am interested in getting more information from people who are in this career and on this career path. Is there any advice you could give for this or related careers? I haven't had the chance to do relevant course work yet but I did get the chance to do an internship with the mayor of my city. City government is not necessarily the career I want to go into but I found it interesting to see how everything runs and the roles that everyone plays in the offices.