I highly encourage you to join your high school football team next season. It will still not (yet) be too late for you to start playing football.
Based on your height and weight, I believe that the best fit for you is at quarterback. Your size, especially your height, gives you the potential to become an elite high school quarterback.
My best advice for you is to work hard and perform very well in practice every day. In addition, what you need to do during the next 12 months is eat healthy, exercise by doing weight lifting, and either jogging or going for a long run every day. If you do these things, you will get faster, stronger, and into better shape, which will greatly improve your chances of being a successful, top notch high school quarterback next season, who could go on to play college football.
By the way, your chances of playing college football depend on your performance in football during your senior year of high school. If you perform very well in football next season, you will greatly improve your chances of getting recruited to play for a college football program.