bruh my crosshair is literary on the guy's head, bullets can't seem to even touch him. Watched youtube videos can't seem to work :(. any Ideas or recommendations on how to get good at duals???

My friends convinced me to lower my sens by over half, but it feels really sluggish to move my camera around even after a week of playing with it. Any suggestions on how to get used to it? EDIT: trying to get used to .333(and .15) 3200dpi,...