Low 22s is a good time for a high school sprinter, especially one that hasn't done a lot of training for the deuce. Work hard at all aspects of your training (weights, plyometrics, intervals) and you may progress to a level to be one of the top 200m high schoolers. Once you have mastered your running form incorporate some uphill training (increases stride length and acceleration) and downhill training (increases stride frequency) and you will see some tremendous improvement. There are some really good books on this subject, check them out.