Originally Posted by Scissor Queen
It might not be you. It could be your machine. I thought I couldn't sew straight either until I bought a Pfaff 10 years ago. Before I bought it I was using an old Montgomery Wards machine. You had to sort of sew at an angle to do quarter inch seams because the needle didn't move over and the feed dogs were set too wide for quarter inch seams.
Then I sewed on the Pfaff. Wow. What an improvement!
When I read this post, I thought of 2 things, the machine being one. I have seen some machines where the feed dogs do not move evenly (like the left moves further than right for ex.). This causes the fabric to take a turn.
The other thing was that you were trying to go too fast. Maybe ease up on the pedal a little, or even pack it so you can't go too fast.
Oh, and one more - are you watching the needle? That can make you sort of dizzy. Watch the fabric just ahead of the foot, or watch the mark (someone suggested a note pad) that tells where the right side fabric edge should be.
Good luck.