I wish i started mining and bying bitcoins back in 2010 like the early adopters.
I was pretty stupid at that time.

I don`t know what`s the point of this "research"?Do you have 21 btc?
I will never have 21 bitcoins.
it is not over yet buddy, you may also earn it by now, just trust , everything is possible. just be patient and determined and success will follow. i have many friends that starts bitcoin years to now that has bitcoin and now happy.
Its never easy to earn 21 btc as very few people would have managed to hold that amount in their wallet and people who are earning bitcoins in different ways would be really struggling to have even 1 full btc in their wallet as earning bitcoin is much more difficult then earning fiat.