Be your own worst enemy

Pro Tip 1/3

Self-sabotage

Refers to actions that hinder your progress, often unintentionally and habitually.

He's always procrastinating, like he's his own worst enemy.

Pro Tip 2/3

Irony and regret

Used when someone realizes their actions led to a negative outcome they wanted to avoid.

She became her own worst enemy by missing deadlines she set herself.

Pro Tip 3/3

Avoidable problems

Implies problems could be prevented if one didn't act against their own interests.

By spreading himself too thin, he was his own worst enemy.