I can nollie, but i cant ollie, help!!?

i started skating two weeks ago, i skate goofy, and when ever i push regular its way too hard and i cant push regular. but anyway skating goofy is way easier and i like it way better. but anyways, i have been trying to ollie for a week now. and i can nollie easily. but i cant seem to ollie. when ever i ollie i cant get the back wheels up. help. btw i practice on my carpet.