Getting your form correct on the deadlift is vital.
If your form is off then at best you will be lifting a lower weight that you are capable of and at worst setting yourself up for a very serious injury.
The way you describe your current form would indicate you are heading for trouble.
Suggest getting your form right first before worrying about the amount of weight that you are lifting. Practice with light weights until you get it right. At the start of the movement you should be squatting down with low hips and ' pushing the floor away ' through the balls of your feet. The bar should gently follow the path of your shins, knees then thighs - never too far away.
Check out online videos and compare your form to theirs.
Not through the balls of your feet man. You'll hurt your ankles.