Yours might be. Happiness in general is about your personal narrative of reality. I'm happier than you are to have not invested in Bitcoin 10 years ago, because I thought it was a bad idea then. I'm not unhappy at the fake money I didn't gain, because I have more exciting fantasies than that. Being unhappy that you didn't win a coin flip sounds like a pretty unfortunate way to structure the narrative of your life.
> It's the opposite. It was bad fortune, as if he had been (according to him) more ignorant he may have invested in bitcoin (even if it was a bad decision), and he would have made a lot of money with such investment.
Or they might have invested in any of the periods where it went down, or in any of the exchanges or coins that collapsed, or gotten too much money too early in their life to develop the skills necessary to make it last. The problem with romanticizing some alternative past is that it's literally just fiction.
Investments are made against Expected Value. The goal is to have enough money to always be making more. Over a long time horizon, you need the probability of gain to be greater than the probability of loss, otherwise in an infinite game you will always run to 0. Engaging in gambling, as defined by Expected Value being less than Principle, is not a possible action for a rational actor interested in keeping their money forever.
You're looking at Bitcoin today like the game is over, like you bought 10 years ago and sell at $20K. What is your selling thesis? What made you buy 10 years ago that allows you to sell today? Or is it more likely that you'd keep holding? What are the probabilities of gain or loss over the next 10 years? 20? All investors see is a financial instrument with no backing, facilitating services we already have, at higher cost than existing solutions.