get up on the wrong side of the bed

It' a bad day today.I feel bad because I have a mistake in my work.I feel bad because I can't put up with my mistake.It should not be happened.It's happened just because I careless of the description in the document.just one sentence I missed.although it is only a small mistake but I can't bear me to do that again.I promise I will never ever slip a cog like this.never!