Fight against myself

I said this in my first post and with my first song.

And so I sent some men to fight
And one came back at dead of night
Said he'd seen my enemy
Said he looked just like me

I figured out today what I should have realized long time ago: the reason why I fail my job interviews is that I'm not able to speak highly of myself. They ask me to talk about myself and I can't help thinking about all my faults and all my mistakes. I don't know what to answer when they ask me which benefits they would have hiring me, because I don't think that they would benefit hiring me...
So... my first enemy is myself!
And what can I do to overcome this situation?
I don't know... but I'll find out, I'm sure!