Don't give up. I feel your pain. Change needles frequently, try a wall size to learn on, practice a lot b4 you start on your quilt. My machine's on a huge table that helps carry weight of quilt, I have a small table butted up to my left for quilt weight. Watch how you guide quilt through machine, if you push-pull against machine speed it can do what you describe. If you can sign up for a FMQ class I recommend it. Teaching videos might help with visuals. Keep practising to get a rhythm.