Ask HN: What Have Been Your Biggest Regrets In Life?

Inspired by this post a few days ago:

Ask HN: Turned 25, Give Me Your Best Advice for the Next 25 Years? https://news.ycombinator.com/item?id=45711816

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Please share your mistakes so other people can avoid the same pitfalls! This can be in your life, career, business and/or relationships.

I am sure many people will find this post valuable.

Thank you!