My wife is an attorney. She says that first, it's important to do well in high school in order to go to college. While in high school/college, participate in mock trial or debate/forensics if your high school and college offer them. These are competitions that allow you to see what being an attorney is like in practice - in a courtroom situation in mock trial or thinking on your feet and making linear arguments against opponents in debate.
It might also make sense to talk to attorneys about their work. Since you live in San Diego, here's a link to the San Diego County Bar Association, the professional organization for attorneys which also administers continuing education (classes that attorneys must attend in order to remain practicing attorneys), in addition to career development.
You can also email people from the directory to get in touch with them. Many professionals enjoy speaking about their careers with young people and can offer insights into how they got where they are, what types of law you might want to or not want to practice, and other helpful guidance.
One important tip from my wife is that the state of California's Bar Exam is very difficult to pass, so it's important to go to a good law school, and probably located in California (so they teach the CA Bar curriculum) in order to be prepared to pass the exam. California's exam is so difficult that it is nationally infamous and a movie was even made about it: This is something you will encounter when talking to San Diego area attorneys.http://en.wikipedia.org/wiki/A_Lawyer_Walks_into_a_Bar
In general, get out there and talk to people and do the best you can to get good grades in school. Get back to me with any further questions -
Best wishes -