Behavior that is self-destructive in one context might not be self-destructive in another. For example, chopping off a leg is definitely self-destructive… but not if you’re suffering gangrene and will die otherwise.
Eating 10,000 calories a day is extremely self-destructive for a normal adult, as it will result in massive weight gain. If you’re an Olympic athlete, it may be just right.
If you’re so obsessed with golf that you’ve quit your job and abandoned your family, you’re self-destructive… unless you’re the next Tiger Woods.
If you have the wisdom to know the difference between positive action and self-destructive action, you will go far. Just because you are passionate about something does not mean it is positive. Plenty of people are obsessed with playing video games, watching sports, or gambling, but none of them have any commercial viability.
Society may consider behavior normal under some circumstances and self-destructive in others. Teen pregnancy is considered self-destructive, but having a child in your thirties is not. Boxing or stunt racing is destructive when done by amateurs, but a money-maker when performed by professionals.
Healthy self-esteem is a positive trait, but wild narcissistic arrogance is destructive.
Half the battle is avoiding self-destructive behavior: the other half is reading self-help articles.