I had very similar problems when trying to make mine last year too. It turned out pretty ugly and unfortunate, especially when my mole sat next to everyone else's moles at school. Everyone else seemed to have been much more amazing at sewing than I was. One person even was talented enough to make their pattern bigger, and made a mole about 3 times the size they were supposed to be, and it was actually quite adorable.
But, it's extra credit, even if it's ugly, so it was okay in the end.