NeispurgeonO - whereas this virus is very easy to catch, it has a comparatively low mortality rate. Your idea of half the population dead is just not in any way correct. Yes, it is expected that over the next few months about 70 -80% of the popultion will get this virus some having virtually no symptoms, most having a week or wo ofbeing really unwell, at at home, A small minority needing hospital care and a proportion of them will die. But, even with the death rates as they are today, it nothng like your projections. You are scaring yourself, and your post may scare many others.
For those who have lost dear family members of friends from this, it will never completely go away. But neither does the ion-going death rates for cancer and such things like heart attacks, which take place day on day, year on year.
The current lockdown is to make at attempt to spread out the number of people catching the disease over several months, and thereby hoping to have enough hospital beds and Intensive care beds for those that require them.
Until such time as both a vaccine and a drug treatment is available, it will not fully 'over'. But that is likely to be 12-18 months, and slowly we will be released from lockdown, maybe for a few weeks then have to go back in for a further week or two. But normality - as we knew it before this is not on the horizon