That;s not a deadlift, that's an RDL.  You need to sit back into in and raise your shoulders and hips at the same rate for it to be a deadlift.  You know the end point of a squat where your thighs are  3611   parallel to the ground?  That's the starting point where your using your thighs.  Start too high and you're lifting with your back, not your ass.  Drop the weight, get the form, try again. That'll be $20 :)