Why can't I Ollie? backfoot never gets any air at all!!!?

i had the exactttttttt problem that you had when i learned to ollie. looking at all tutorials on youtube and stuff were all crap. when i first started getting them, i would hold on to the side of a fence and practice, i just felt more comfortable. and what i figured out that nobody really told me is that when you pop the tail, while you slide your foot up you want to ROLL your ankle up the deck with it also. when you do this, i evens out the other end of the deck. and make sure that you kinda jump too at the same time. try practicing this on a fence.