Slightly Annoyed...lol

I have not knitted in a very long time (since I was a kid). Even when I did knit, it wasn't anything amazing. But I thought, hey... let me give this a shot. So I am trying to knit something as simple as a scarf, but for some reason instead of getting a rectangle shape that I need, it starts curving inward into this funky triangle shape.

And I am like dang! What in the world happen? So I ended up having to stop, because it was going no where fast...lol. So I just ended up sewing up the two sides and it fitted nicely on this Barbie. Cute - but not what I was going for. I need help in the knitting department.

*On a side note: You gotta love this shirt!