My biggest mistake was not buying in back when BTC was somewhere around $10 USD. I started reading about it then, and figured I would get in to it eventually. Well, I have a busy life and wouldn't you know it, while I was "busy," BTC exploded. I think about it every day. I could have been rich, but life happens, and I have no control over what I didn't do in the past so I don't let it bother me too much.

I don't know mine off hand, however I keep what I can recorded on a piece of paper (a habit of excessive amounts of paperwork in my daily job). I also use 15 to 20 addresses per month so it would be near impossible to remember them all. Hell, I can barely keep track of people's names.