whenever you feel yourself pussying out just imagine a hot chick in a bikini walking away from you, shaking her head.
but for serious, I have the exact same problem. I'm nearly 28, I started skiing park 3 years ago. I ski 1 week a year. I literally just got back from 10 days in whistler yesterday. On day 1 I was so stoked to be skiing after a year of not skiing, I was spinning (360's mostly, some 180's) off the big jumps in whistler. I had landed maybe 2 or 3 540's before.
then o day 2 snow came, we hit the trees and in-bounds off-piste for a few days, I landed my first cork 360. all good. then the sun came out and everything was tracked out by then, we went back to the park for the last 3 days of my trip.
My confidence was gone, the landings were super hard and I just shifty'd everything for 2 days. I under-rotated a cork 3 on the last jump in the terrain garden on blackcomb. bruises everywhere. So embarrassing. I could feel my balls shriveling up and then I started knuckling everything.
On the last day the sun came out. Things softened up a little, but the blackcomb park was still running fast.
For some reason I just started spinning the big line, 540 double safety, big slow 3's and 1's, 720's on the tranny half way down, spins over the hip....
I basically never hit rails either and managed to front 270 off one of those long thin tubes.
Now, nothing here is particularly inspiring, trick-wise. But it was good for me as I hardly ski, and all of a sudden I was in my little zone and it was all easy. Now I just want to go back, hit bigger kickers, slow it all down, go deeper etc etc etc, because I proved to myself that I can do it, and 70% of park is confidence I'd say.
What I learned:
On a day when you're feeling comfortable in the park - not invincible (because you wont feel that) just comfortable - spin a bigger kicker than you have before. Go fast and don't knuckle. At first just get used to the kicker, dial in the speed and straight air it a few times, and then spin it.
Factors which helped me:
Last day of holiday
Kodak confidence (people filming)
Riding with buddies
Sun was shining
Park was quiet
My boots didn't hurt
So, this was super long - anyway.... hope something helps.