Worrying in itself is not a bad thing.
You will develop anxiety, which not only causes emotional suffering, but over time will affect your heart, digestive, and nervous system, as well as many other systems in the bo.
Overthinking is a self-destructive behavior, taking a serious toll on both your mental and physical health.
You become paralyzed by fear of making a mistake, causing you to not act.
When it gets to that constant and obsessive point, though, it inhibits success.
It shows you care.
Worrying in itself is not a bad thing