Okay, here's the quick and simple solution. You have a good golf swing but you are not in the best position to use it. With your hands so close to your body at address that you have to mve the hands away from your body at takeaway and that causes your body to raise up and then your swing becomes too steep and cause you to pull the club too in on the way down causing chunks, thins and rights.
Fix your posture. Bend more at your hips so that your arms are hanging more down and away from your body. From there then feel like your hands and grip on the club move towards your body on the backswing. You will then have more weight on your right side at the top of your swing and then you use your left side to turn out of the way faster. It will feel like you are swinging more to the right from the top of your swiing. This should help you hit more solid shots.
Now go make that team and start on a great High School golf career!