In quick reply it is difficult to center issue, however;
Confidence = control in many cases
Confidence originates in brain and belief in your own abilities to contol ski.
Solution
1. Practice on "easier slopes"
2. Increase difficulty level slowly
3. Increase speed and more aggresive technique on easy slope.
4 Follow a more "expert" skier. I mean expert here. Not skier who skis fast! They are two different things. An expert skier may ski fast but always under control!
Follow his line.
Confidence will come with success at every step!
Success=happiness=confidence= progress!!
My side bar!
Too many skier try to go the top too fast. Try to take the runs too fast thinking an "expert" ski is a "straight down the hill man/women"
Be patient, learn the basics I promise you the dividends will be much greater.