be (one's) own worst enemy

To do things that complicate one's life and/or keep one from success; to be self-destructive or self-sabotaging. Of course Tommy started skipping school again—he's his own worst enemy. She always sabotages a relationship when it's going really well because she's her own worst enemy.

Common Names:

Name	Pronounced	Usage
Emalee	-	English (Rare)
Sigrun	-	Swedish, Norwegian, Danish
'Ismat	-	Arabic
Grimes	[graimz]
Helmuth	HEL-moot	German
Euadne	-	Greek Mythology