Horrendous. Get well soon.
But as has been pointed ,no vehicles , crumple zones, air bags etc can make you completely immune from injury in a head on collision if the speed (or the combined speeds of both vehicles,) is high enough. The physical forces involved can be massive and they increase by the square of the velocity. (ie You may assume the energy of a 4 mph impact is only twice that of a 2 mph impact.Its actually 4 times as bad (2 x2 ) and rises exponentially as speed increases.
At one time police road safety officers had a little demonstration rig at county shows etc. where you are strapped into
a car seat wearing a seat belt, then rolled down a slope until you hit the bottom at about 2 mph. The sudden stop, even at 2 mph gives your body quite a shocking jolt intended to make you realise the benefits of a seat belt (no air bags in those days)
It sounds like the safety systems may have saved your life . I assume that some cars involved in major collisions will be examined by Road safety and Honda engineers ,to assess how effective the systems have been, and whether there is still room for improvement.
Can you remember if you were able to come to a complete stop yourself immediately prior to the impact, or whether the Collision mitigation system also activated and helped reduce impact speed a bit? (Activation might be recorded on the ECU, )
The fact the police tried to speak to you is not a failure of the automatic emergency call system. Some activations will be false alarms that they could then cancel having spoken to you. It will also help them them assess how badly hurt you may be, or you might be able to give useful additional information about what help needs to be sent. But if you are too badly hurt to respond verbally they will send help anyway using the automatic location system.