A lot of people make excuses for their mistakes.When they first get confronted with a failure they just end up giving excuses for the mistakes they've made and they literally don't evaluate, at least, what happened to things end up that way.
I agree that not everything is under your control. There are a lot of things that can turn out to be wrong and you cannot control.
However, it is important that you set yourself up, evaluate your mistakes and study how you can improve and prevent this from happening next time.
So, this why I say: stop with the excuses and pay the consequences!
Stop Making Excuses & Take Fucking Action!: https://www.youtube.com/watch?v=iqz0gkGpARg&index=101&list=PLjwWT1Xy3c4XRTEK79UXmtkUT-jsP4rUP