At your age - 16, don't concern yourself with pitching right now. You have more important priorities on your horizon. First is your body's reaction and temperament to the injury (depending on the calibrated ranking of your injury), then your future quality of life into your mature years. At 5'8" 150 pounds, there's not much to work with here, so go easy.
Your surgeon in concert with your therapist has specific do's-n-don'ts that you must follow to the letter. You'll be reminded of those "don'ts" every time you reach for a doorknob, raise a window, turn a steering wheel, carry your books from one class to another and so forth. To put it bluntly, this is nothing to screw around with - SO DON'T.
I've worked with my fair share of guys, mature guys at that, who have had this surgery and I'll tell you honestly, you don't want a life of agony and pain doing the simplest of things - like rolling out of your bunk on that shoulder. Trust me on this one kdub. Let this one go. Focus on other things besides pitching and addressing loads on that shoulder.
Ask you therapist to read this posting and see what he/she has to say. I'll go as far as saying this - you'll never be the same now that you've had this injury. In fact, the older you'll get, the more your body will remind you.