Don't forget that you are the result of all the past sensory interactions that you experienced in your whole life, people you interacted with, books you read, advertisements, songs, news headlines, etc. Even if you think you don't remember them, at one point in your life it was processed by your brain and may have changed some posterior decisions you made, thus making you what you are now. Since I realized this, I am…
Hmm. The experiences that changed and benefited me most were least predictable. As a result, I try to manage experiences less, and choose the unknown more. But in the spirit of what you've said, I try to avoid doing dumb, damaging, or boring things twice.
As a parent I tell my kids: "Make lots of mistakes. Learn from them and don't repeat them; avoid the fatal ones". Then I try to remember my own words before I chastize them for their multitude of dumb decisions (teenage boys)...