I sure do understand perfectly, there is a saying which goes "better late than never".
We all are happy we are here, at some instances, one might feel this regret of not being here when bitcoin was way cheaper, but honestly, I come to understand that in life, every thing happens at their time, nothing happens by chance, those who knew about bitcoin when the price was zero, knew about it because it was their time to know about it, and not even all of them are rich today.

It is not out of place to sometime feel bad for not knowing about an opportunity on time, but then, don't take it to heart, for what will be will surely be.