The breakout was forming. I could see it — clear support level, volume building, momentum shifting. I circled it on the chart. Sent it to a mate. Then price reversed hard and I realised the support level I'd drawn was two days old. I'd ignored three failed tests in between because they didn't fit what I wanted to see.
This is confirmation bias — your brain's quiet editor, deleting evidence that contradicts your view and highlighting anything that confirms it. You want the trade to work, so you find the chart pattern that says it will. You ignore the divergence, the failed retest, the weakening volume. You're not lying. You genuinely don't see it. Your brain filters it out before it reaches conscious thought.
The moment I started questioning my strongest convictions was the moment my trading shifted. Not the weak ideas — everyone questions those. The trades where I felt certain. Where the setup looked obvious. Those are the dangerous ones because certainty is a red flag, not a green light.
The fix isn't positive thinking or discipline lectures. It's premortem analysis — actively hunting for reasons the trade will fail before you take it. Write down three specific ways this setup could be wrong. Not vague doubts. Concrete scenarios. Then check the chart for evidence of those scenarios. If you can't find any contradicting data, you're not looking hard enough. Your brain has already hidden it. This is also why trade journals matter — they force you to document what you actually saw versus what was actually there. The gap between those two things is where confirmation bias lives, and where your edge dies.
This content is educational only and does not constitute financial advice. Past performance is not indicative of future results. Always seek licensed financial advice before trading.