anyone else not feel “tightness”

i’m 3 weeks post op and my surgeon has recommended mobility exercises for about the past week. they originally just said i could start shoulder rolls and airplane arms. meaning just not going above a 90° angle. now that i’m at three weeks they told me to just raise high enough that i don’t feel the “tightness.” i don’t even get there. i tried and i was almost able to put my arms straight up and still hadn’t felt anything. i stopped myself because i don’t want something to happen. i’m definitely still very numb so i’m worried i’m hurting myself and no realizing. did anyone have this issue?