No, my best advice for you is to continue playing football. At this point, it is not worth it for you to quit on your high school football team.
Just work hard and perform very well in practice every day. In addition, what you need to do this autumn (and every offseason) 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 becoming a successful, top notch high school football player, 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 during your senior year of high school, you will greatly improve your chances of getting recruited to play for a college football program.