Ahh so he is the guy who bought the world's most expensive pizza

Guy must be so mad he paid millions of dollars on a mediocre dominos pizza. I hope it was good...
The guy who sold him the pizza must be pretty happy.
Missed my boat on btc as well...
That pizza could have been one of the triggers for bitcoin's rise.
You need to have real life transactions before you can call your collectibles as currency.
For all you know, if he hadn't bought that pizza bitcoin's price trajectory might have been totally different.

It only got a lot of media attention after the sudden price rise, thus making the pizza so expensive, after Bitcoin value had risen.
Point being, there would be another purchase if the pizza thing didn't happen, don't think that changed anything.
And to OP:
It's silly to have regret, you can spend your whole life feeling sorry for yourself that you didn't get into Bitcoin sooner, or you can focus on earning more instead of that.