In the year 2010,my best friend introduce me to cryptocurrency and he advice me to invest in bitcoin. I felt bitcoin was another ponzi scheme created by scammers to scam innocent people. Today my friend is a multi Millionaire. If only I had listened to his advice,I would have become a millionaire by now.
Yeah one can regret he didn't do even he had a opportunity or make self happy by thinking "woo I almost become". If word always plays vital role. But main thing is even if you had bought/invested at that time there is no guarantee you would have hold so long until it reached big enough to make you millionaire as many early adopter sold them as soon as they got some profit. Like this one: https://cointelegraph.com/news/early-bitcoin-dev-misses-out-on-1-3b-after-selling-too-soon