I wouldn't worry about it. College students change majors all the time and your four years away from it if you decide to go. I thought I was gonna be a pharmacist but now I'm majoring in criminal justice. In ninth grade I thought for sure I was going to have a career in the medical field. I still could someday down the road.
Overall your in a great position in my opinion. In 9th grade you've got options open for classes you might want to take such as a foreign language, chemistry, biology, history..anything. If you go to college your first semester/year will likely be a repeat of what you learn in high school so don't feel to overwhelmed. Basically keep an open mind towards things your interested in and try them out. It's not like your committed for life in high school. Just enjoy the ride and do what your interested in.