This is my fifth year using bitcoin now. I heard about it at around 2011 however didn't act on it at all, lots of tutorials at that time about how you can mine coins on your laptop and potentially get a reward for a block. I thought that it was just another scam.
Only got into it at around 2013 when it actually took off to the moon. Some things you just have to regret forever.
I would probably regret my decision forever as you said if i were aware of this at that time when we could mine bitcoins with our laptops without any hardware and other equipment, and did not take it serious and after a few years that touches the sky.