I know I've already asked this question to Calandale but I'm also interested in what your answer would be.
Do you feel your biggest regrets centre around the things you did do or the opportunities you let slip through your fingers?
I only have one regret specifically about a relationship that I had, that I wish I hadn't, but only one. That is the only regret I have that I can remember.
As for opportunities that I've let slip by, no, I don't have any regrets because I can't really think of any I let slip by to be honest.
If one comes to mind, I'll let you know.