Not possible,. The worldwide hospitalization rate does not support that, even using Germany's outlier numbers.
You are basing your conclusion on incomplete information, and faulty reasoning. No government authority anywhere has been testing for antibodies that would indicate if a person has already had the virus and recovered. They have been testing to see only if a person has an active infection.
Over half of those infected have no symptoms, another 30% have symptoms mild enough to basically be ignored. The numbers for young people are much greater than that. The Italian government has stated that 99% of the people who have died there had underlying conditions or circumstances which made them vulnerable.
This is very serious for people who are old, sick, smoke marijuana or tobacco, or have other medical histories histories that make them vulnerable. For young healthy people it is almost nothing 90% of the time.