Introspection about our less-than-perfect decisions might be painful, but it's almost always less of a pain than making the same mistake multiple times. That's why it's important, especially in the context of investing, to take a moment to reflect on the mistakes that other people made -- so that you can avoid making them yourself and paying a steep tuition in the process.

So without further ado, I present to you a trio of my worst investing mistakes. I highly suggest that you read on and learn these lessons the easy way, rather than the way I did!

In the timeless and stupefyingly simple words of famous investor Paul Tudor Jones, "Losers average losers." By that, Jones meant that it's often a folly to buy more and more shares of a stock as it goes further and further down over time in the name of lowering your average share price paid.

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Source Fool.com