be (your) own worst enemy

if you are your own worst enemy, you do or believe things that prevent you from becoming successful.

Unless he learns to be more confident, he'll never get a decent job. He's his own worst enemy.

• hitch wagon to something
• hitch your wagon to
• hitch your wagon to someone
• hitch your wagon to something
• hit hard
• hit home
• hit it off
• hit it off with
• hit it off with someone
• hit like a ton of bricks
• hit list
• hit man
• hit on
• hit on someone
• hit on something
• hit or miss
• hit pay dirt
• hit right between the eyes
• hit rock bottom
• hit someone between the eyes
• hit someone like a ton of bricks
• hit someone right between the eyes
• hit someone up
• hit someone where it hurts
• hit someone where it hurts most