It sounds like you are in the back seat. Try this.
Go to the bunny slope (yes, just do it; leave friends to go shred the mountain without you for a while).
Ski straight down.
Lift one ski tail, keeping its tip in the air an inch or so. This guarantees that you are forward, not aft, on the other ski.
Edge the ski you are standing on to its Big Toe Edge (BTE), and you will turn. It doesn't take much edge.
If you can't lift the tail and keep the tip in the snow, you are really stuck in the back seat. Bend that other ankle forward big time and get your hips forward. Stand up TALL and reach forward with your arms. That should do it.
Repeat skiing straight down on that bunny hill, alternating which tail you lift. This will result in you making turns left and right. Feel the forwardness you have achieved by lifting the tails. Keep at it, without friends around, until you can stay forward, edge the ski you are standing on, and lift alternating tails, making little turns. This is so cool! play around with how far forward or centered you can get while making turns with the edged ski. Play around with how edged you can get that ski you are standing on without falling over. Gain control of your forwardness/centeredness, and of your edges.
Then go to an easy green trail and repeat. Keep lifting alternative tails, with the tip staying in contact with the snow.
Progress to easy blues. I bet with some practice you can do it on blacks too.
This drill will teach you to stay forward. Do it until you can keep forward or centered (in both cases, NOT aft) without lifting the tails.
When you are successful, the nose of your ski will stop being airborne (lifted noses are a sure sign of back-seat-ness).
The wobbly inside ski whose tail is most likely stuck in the snow while its tip waves around in the air will begin to behave.
You'll be well on your way to controlling those substantial planks on your feet.
Edited by LiquidFeet - 1/10/14 at 2:54pm