Are you aware that when you trade goods, services or fiat currencies for Bitcoin, you actually bought nothing. In other words, by buying Bitcoin you sold the ownership of something and bought the ownership of nothing. Bitcoin is the first time in human history that people voluntarily and massively give up something to become the owners of absolutely and literally nothing.
Never new that nothing could at one point cost 20k$. We are living in a digital age my friend , all of our time is spent on the internet and most of our daily life matters are run through it. A car for example is given that value because of the prices of its parts with the commision of the company , same goes for for bitcoin , many computing power goes into mining a bitcoin thus give it a price of the electricity and the time of the miner , yes it might be overpriced but atleast it's something .
Well, if you give someone your 20K$ car for free - as a gift, and then mark this event with a numerical symbol in some database, that doesn't mean this numerical symbol costs 20k$. Same goes for bitcoin.