How do I stop blaming myself for the deals I missed?

You can find what is hidden in almost any deal, and you carry the ones where you did not look hard enough, the misses that still weigh on you. That weight is the shadow side of caring about the work. People who do not care do not carry anything. You do. But sit with this honestly. No one, however skilled, catches everything. Diligence is about reducing risk, not achieving certainty, and hindsight makes every miss look obvious when it was not at the time. Judging your past self with knowledge he did not have is a cruelty you would not aim at anyone else. Learn what the misses can teach, then set down the blame. Turn each one into a check you now run, so the lesson lives on without the guilt. You honor the deals you missed not by punishing yourself, but by being sharper on the next one.