it's not to be regretted, because bitcoin will continue to grow and if you do not jump into bitcoin now you will only be a spectator in the bitcoin glory in the future. not too late, start learning trading, mining and becoming bounty hunter now.
I never heard about it until one of my friends introduced, so no regrets. I catched up what I can as soon as I felt it has something and look at the support. Bitcoin got more support from a common man than any other currency so I knew it'll be something one day.