Don't spend your time regretting and spend it finding the next best thing, a lot of people don't think the early investor ship has sailed for Bitcoin yet!
We are still the early adopters of cryptocurrency. So there is no need to regret.
Early adopters era is long time gone. I guess early adopters were people who buy/earn/mine bitcoin under the price of $100.
Ignoring the possibility that everyone here today will be early adopters if Bitcoin's market cap reaches trillions, I think there are different phases of early, mid, and late adopters.
The very early adopters were those who knew about Bitcoin before it started receiving mainstream attention in the run up to the June 2011 bubble. Before then, very, very few people knew about Bitcoin and its price was measured in cents. In fact, it only reached dollar parity just 2-4 months before the first bubble burst. Some of these very early adopters were involved in the cypherpunk community, some had conversations with Satoshi, and many - if not most - were libertarian computer geeks. These people mined BTC on their CPUs and later GPUs although there weren't many places to spend them at the time.
The rest of the early adopters came during and after the June 2011 bubble. By then, Satoshi had long gone and bitcoins were being mined using high-end GPUs. The price was in the single digits for most of this time.
The distinction between the latest early adopters and the earliest mid adopters is quite blurry. Despite staying under the mainstream radar for all of 2012, numbers of Bitcoiners were still growing and the price was steadily rising, albeit slowly. By early 2013, references to Bitcoin were beginning to rise again and the run up to the April 2013 bubble could be considered the transition point between early and mid adopters. Mid adopters bought their coins in prices at the double digits and low triple digits. Early 2013 was also when the first ASICs were introduced.
As for the late adopters, I think it's fair to say that they were the ones who came after the November 2013 bubble.
A bird in hand is worth twice in a bush. There is no point in regretting about something one did do or dint think about earlier but there will be more chances in future. Bitcoins are worth more now and investing these bitcoins in a legal website or trade will be a wise option.
What do you mean by "investing these bitcoins"? Do you mean that he should set up his own website or trade or that he should invest his bitcoins in a website like a dice site?
Why are you basing your happiness on whether or not you are a millionaire, that is silly. There are so many more worthwhile things to pursue than just the acquisition of money such as the pursuit of noble causes and helping others. This is the only sustainable source of happiness and being a millionaire of itself would certainly not make you happy so you should not wake up feeling depressed every morning for this, you should wake up every morning and think how you could make the world a better place for both yourself and others in your own little way, that will bring you far more happiness than a pile of meaningless paper or numbers on a screen in your possession.
I'd hate to sound negative but if it's "meaningless paper" and "numbers on a screen" that puts food on the table, clothes on your back, and a roof over your head, then I would say that it's pretty important.