Knees feel weak during Toeside Turns!

I don't know if it's the fear or my inability to do toe side turns. I feel very comfortable on my heel side but when it comes to toeside, I feel weak, shaky, and unbalanced. I usually do the heel side falling leaf during all my runs and I want to break that habit!

I'm going snowboarding tomorrow and would like to know how I can effectively do a toe side turn. How can fix my problem and finally connect that heelside turn to a toeside turn?

Thanks!