Okay, that's not too bad, it might just be tight for the first few rounds. Do what I suggested - pull out the cord about 2/3 of the way around and knit to the loop, then do that again. Keep doing it a couplethree rounds and then the sts should fit around without the loop.
eta - Hmmm, I forgot you're using size 13s, so you should have about 3 or 4 sts per inch and they should fit around. Is the problem that the sts don't fit around the needle, or that they're too tight ON the needle? If they're too tight on the needle tips, you may be pulling the yarn too tight. Which cast on did you use, that sometimes makes a difference.