Your worst enemy

Uh...my worst enemy. I don't really have a person who is my worst enemy. I may of had people that pissed me off but no real enemies.
I'll guess I'll have to go conceptual so my own worst enemy is procrastination and self doubt. Actually, self doubt is probably at a higher ranking than procrastination. Self doubt keeps me from speaking my mind. It stops me from making advances in my life. Even when all the steps are laid out before me, my future can seem insurmountable but when I look back on something that I thought was going to be difficult, I find that it usually was not that hard. It just took some effort to get going.