Okay, it sounds like you're making a triangle shawl/scarf. If you're using fingering or lace weight yarn size 13 needles is probably a bit large and makes it more difficult. I knit a lacy scarf recently and use fingering weight and a size 8 needles.
Another thought is what material the needles are. If they are metal fine yarns are harder to knit at first. A lot of people find that using wood is easier for yarns like that, but it does depend on the fiber, too.