I had this quite early on with my c-sec scar. Also had this weird pressure in the scar. Both seemed to ease over time so hoping that yours does too.
I haven't had a c-section but have worked in surgery. Your Dr is right about scar tissue. It won't stretch the same way your uterus and skin will so I'm sure it hurts. Depending on your baby's position, it may get more uncomfortable as your our pregnancy progresses. Hang in there!