My deadlift is not going up, and its the most uncomfortable exercise i've ever done. I've been trying to do them for well over a year and they just don't go up. I've gone from 95lbs to 135 in the past year, while my squat has gone from 85 to 175. There has to be some reason i'm not going up, my form is okay i *think*. I try to keep my back straight and use my legs to lift, but it always seems as though i'm using my back. Any ideas what i could be doing wrong?