One thing I'd say is that if you're that good already then don't bother having lessons yet. Most local pro's won't have half the talent you have and will probably do you more harm than good.

Even though you're 18 you are still young enough to have a go at making a career out of golf if you have that much talent.

Golf is a funny game though, I have quite a bit of natural talent (nowhere near yours though) and was hitting 12 GIR after 1.5 months but now after nearly 3 I can barely hit the ball

Where did you learn to swing? Do you have an orthodox swing or a swing only a mother could love? I'm curious to know how you got to where you are so quick, maybe we could all learn something.