A good way to release your fear from being struck and by that learning to move freely is to have a few friends hit you all over using anything from fists to shovels for a long time. The body will not survive without letting go of the attachment to being hit. Smile. It hurts less this way.
With a partner walk along side each other and randomly hit each other. Move so there is no warning to the hit by moving only what needs to be moved, Keeping your breath free from the intention and move without any aggression, relaxing your face and by this you will learn to move without the restriction of fueling yourself with aggression to hit.