Muser,
Should I be looking to take flight lessons from now? Should I wait for an aviational university? Should I be reading any material or textbooks to prepare myself?
May I suggest, since you appear to have no direct familiarity or contact with the aviation scene, to pop down the local airfield and talk to a few pilots. Perhaps hang around a local club or FBO if there is one and try to get a part-time job there, maybe in exchange for a bit of flight time.
Get to meet and talk to as much aviation people as you can (pilots, mechanics, dispatchers, etc.), but do it in person, not on the internet. Then you will be much better prepared to make a decision and present your plans to your parents in an effective way.
Best of luck.