It's not how many people you know or having a supportive family (though both help). It's more about how socially connected you feel you are.
Since when did you need to be 'qualified' to hep another human being. Social contact, warmth, a sense of belonging and supportive relationships are powerful healing agents. By contrast, the systems of care that we rely on are overworked, inadequately resources and, to many people, unavailable just when they are needed most.