If there was one 'wrong' that you could right from your life, what's it gonna be?

If given a chance, what wrong would you right from your life? What is something that you'd wanna undo and redo it?
I'd definitely strike off those college years which I wasted on something utterly stupid and redo them in the most meaningful and efficient way.
If there was one 'wrong' that you could right from your life, what's it gonna be?
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