Place a fist to the face and relax, tense your neck and face to push the fist away and in this manner you learn which muscles you use to resist the movement. Exhale and relax those muscles and let the fist move without following it. Proceed to repeating this drill with your eyes closed and tensing up at the moment of contact and simply paying attention to the tension in the body. Proceed to focusing on breathing continuously as you are now hit from every angle and direction.
Proceed to letting the arms from the shoulders touch the hitting fists and arms or stick if you have one without moving or impacting on them.
Proceed to letting the head shoulders and arms move out of the way and into ending the attack on the same movement without creating any tension inside you from moving someone aside.
This is not always possible but a good drill to release fear of contact and learn to move.