Back is rounded on initial pull. Chest is down. Hips are up. Bar too far away. Leaning ahead. Finished lift on your tip-toes.
You DESPERATELY need to keep the weight much much lower and pull good reps. I highly recommend watching a video or two of Mark Rippetoe's set up for deadlifting.
And stop jerking the weight. Nothing will get you looser than that. You zap any kind of energy and tension you have to make a good pull. Again, start with very light weight. Based on the 225x3 I watched, you need to stay around 135-185 for sets of 5 until you get the hang of the technique.
Keep trying....all you can do is get better from here on.