I highly suggest waiting until you got to college to start growing. In the 6 month period until then, just do lots and lots of research. You can actually harvest professional quality bud in your first grow with the proper research.

Grim reefer made alot of great point about your dillemma. Listen to him.

Oh, and dont tell any of your college buddies about the grow. The ONLY safe way to grow is when nobody knows about it.