You will get a Bachelors Degree before going to Law School. It normally takes 4 years of fulltime studies to get a Bachelors Degree. You will then attend law school, which is an additional 3 years of fulltime studies! Seven more years total, after high school.
You first need a 4 year bachelor degree before you apply to law school. Law school is then another 3 years. You will then have to pass the bar exam to get your law license. Depending on when the exam is offered in your state that could take another 3-6 months. All this time goes by faster than you think and is worth it.
I wish you the best of luck!