There's lies, damned lies, and statistics. You need to interpret these stats.
America is a very broad place with a lot of different types of people. We have millions of people that refuse to accept medicine due to religious reasons. Similar to beliefs around birthing children. There are more weirdo's here than anywhere else. This works in America's favor in many ways but is negative in many ways too.
If you're a normal person you don't have to worry. Subtract the weirdo's from the datasets and outcomes are fantastic. The same thing with all these other health and life expectancy numbers. If you're normal, avoid obesity, don't smoke or do drugs and avoid a variety of high risk behaviors, and visit your doctor then you're likely to live a long life.