Here's the key to success: Merciless self-hatred. What you wanna do is constantly evaluate yourself against some impossible, unreal standard and stick to it. DO NOT ENJOY SUCCESS, EVEN FOR A MOMENT - that's called weakness. Weakness is a great reason to hate yourself, so remind yourself that you're weak a lot. It's like being your own personal coach - abusive and scary.
Assume you can't do it, force yourself unreasonably, and then make small failures into big ones. It's all about perspective - small failure = big failure, small success = failure, actual failure = exactly what you thought you were capable of in the first place, you weakling. So you predicted successfully - success.
I believe in you. Hope that helps.