Start riding with folks who are better...forget everything and just try to keep up. And if you fall, its fine, just pop back up and mob. You need to get your head out of the way...thinkin is too slow...your body is starting to know what to do...so if you start to fall...struggle to keep going...let your body do everything to keep going, you'll be suprised.
Another thing is to pick a spot further down the hill to end up at and then is getting used to reading/anticipating the terrain infront of you...start looking at the terrain 50 yards down the hill and trust your body to deal with what's flying under you at the moment...you can't think fast enough for that...and if you do...its too late, you've already rode it. Its about staying ahead of the game and your riding becomes more stragetic or tactical...how are you are attacking the line instead of reacting to the line.