I just thought of something... are you knitting inside out? In other words are you knitting on the inside of the tube? If you are then the purl bumps will show on the outside. When you're holding the needles they should be close to your body and the circle of knitting, the tube, should be away.
See how she's holding them here? -
http://www.knitpicks.com/tutorials/K...dle__D116.html
If that's not the way you're holding the needles that could be the problem. I'm not sure, but I think you can flip it right side out and continue w/o having to restart.
I know it's frustrating, but keep trying. We all had to learn some time and we all still make mistakes.