Im the youngest player on my basketball team(and tallest) by two years.how do i prove that i am really good without messing up?
Use your height. Age doesn't have as much to do with it.
If your tallest than your already appear professional
I believe the best thing to do is to use your height to your advantage and ensure you are in control of your position in the court. You also need to pay attention to the coach and follow his leads and you will be okay.