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 the wide receiver position. You have the ideal size for a high school junior wide receiver.
My best advice for you is to work hard and perform very well in practice every day. In addition to weight lifting, what you need to do this autumn (and every offseason) is eat healthy, and exercise by 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 becoming a successful, top notch wide receiver in high school football, 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 junior, and especially senior, year of high school. If you perform very well in football during your final 2 years of high school, you will greatly improve your chances of getting recruited to play for a college football program in the future.