I can't ollie, HELP!?

Very embarring, I have been skating for 7 months and I can't ollie yet. I am amazing at vert, (go to skate parks twice a week) I can do airs and skate bowls. But I can't ollie yet. Whenever I try at home I am scared of falling and my board goes sideways. Am I not popping hard enough? Is my deck to heavy? My first deck was a plan b acid drip deck. Then I got a mystery because I chipped my plan b and it got bad razor tail. This may hard to believe but when I was in Volcom skate park in Costa Mesa, Ryan Sheckler showed up and signed my mystery board. So I don't really want to skate my mystery anymore. Which deck is best for vert and learning how to ollie. Don't answer any other brands besides these. Alien Workshop, Almost impact, Baker, Flip, Girl, Plan B Prolite, Toy Machine, or Zoo York. Which is the best for vert and very little street skating (for now)? Should I get a 7.6 or 7.5? Please have good answers because my friends laugh at me everyday because I can't ollie. HELP!!!!!!!!