I'm the same way about park. I started when I was 17 and watched all my friends who have been riding for years hit huge jumps. When I tried my first big air; after building up the courage, it was disastrous. I seriously couldn't walk or sit right for 2 weeks. After that I got better at sticking the landings but totally lost interest in it. After that I devoted all my future seasons to glades. Mostly because I'm an east coast rider and that's where its at.
My friends and I joke thats its the only way to have fun in the east.
Some more advice:
(If you don't already)
Having strong legs and a solid back combined with great abs will make turning easier.
Lunges are a must for any snowboarder as it hits the major muscles you use when on the slopes.
Ankle Strength is another important factor (stretching to avoid injury)
So pretty much work on the 3 category's I spoke of earlier. (If you don't already)
Also check out post's by Snowolf
The guy has some crazy good advice that I wish I seen when I first started.