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.
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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.
be your own worst enemy
act contrary to your own interests; be self-destructive.
1993RichardLowe & WilliamShawTravellers We convinced ourselves that everything was against us but the truth was we were probably our own worst enemies.
be your ˌown worst ˈenemy
be a person who often creates problems or difficulties for himself/herself: He spends all his money on clothes, and then finds that he’s got nothing left to live on — if you ask me, he’s his own worst enemy.