Bethany, what kind of pedals do you have? If they're the platform/SPD ones, just take the cleats out of your shoes. If they're "regular" clipless pedals, swap them for platforms next time you go to your LBS, or if your bike came with the toe cage-equipped pedals that you swapped out, take off the toe cages (they're held on by a couple of screws.)

As for the hills, I understand. Give yourself permission to walk. They'll get easier as you keep riding. It may not seem that way, and it may take a while, but you'll be able to ride up those hills eventually.