All humans have a tendency to be a bit more like Eeyore than Tigger, to ruminate more on bad experiences than positive ones. It’s an evolutionary adaptation — over-learning from the dangerous or hurtful situations we encounter through life (bullying, trauma, betrayal) helps us avoid them in the future and react quickly in a crisis.

But that means you have to work a little harder to train your brain to conquer negative thoughts. Here’s how:

Don’t try to stop negative thoughts. Telling yourself “I have to stop thinking about this,” only makes you think about it more. Instead, own your...