What are your regrets in life so far?

On the one hand, I have many regrets about not trying to be friends with certain people from childhood. On the other hand, maybe things all happened the way they were supposed to. That is, if I were to go back, I might wind up still feeling trapped by circumstances not allowing me to be friends with them. Like I tend to think now, "oh, I could have listened to what people were talking about, and at the very least whisper a related comment. But then if I were to go back, maybe there really weren't that many moments that I could have come up with something to contribute.

What are your regrets in life so far?
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