There's good info here but one of the places no one has mentioned is your local Game and Fish department, they usually have hunter safety courses available for free, I'm sure you'll have an office closer than 50 miles, give them a call.
If you're in HS you're old enough to know you may not be able to talk your parents into getting you a gun, BUT, if you take your classes on your own, go shooting with relatives and show good gun sense (or at least learn it) and show that you are responsible they may come around, one of the things I always told my kids "Don't tell me , show me".