Yeah, you know, I think of 1 and 2 a lot, but I also think it's partly a crock. E.g., as a kid I always wanted to be a writer. But I also grew up on Food Stamps and never wanted to be poor again. So I ended up being a lawyer. So now, when I think, gee, I wish I had stayed true to that original dream and been a writer, I am really thinking of the dream ("gee, I wish I had written the Great American Novel and was now a well-respected and well-paid author"), not the reality ("gee, I wish I had struggled to get by for years on what I could scrape together from freelance work while desperately seeking a publishing deal for that half-written manuscript in my desk drawer"). In reality, I was true to myself -- I was just true to the part of me that valued economic security over creativity. Which was probably the right call, since I'm not particularly creative anyway. :-) And now that I am economically secure, I hope I have many years left to try to get back to more right-brain activities and scratch that itch too.
IOW, regretting what you didn't do undervalues what you did. You chose X or Y or Z for a reason -- some part of you needed what that gave you. Better to acknowledge and accept that and be proud of whatever you did accomplish instead of what you didn't.
I think this also factors into 5, which I heartily agree with. Life is a choice. You control more than you think -- and even when you cannot control what happens to you, you always control how you react to it. The single-most important thing I have learned in my 50 years on this planet is to actively look for the positive and force myself to be grateful, i.e., fake it till you make it. It's ok and normal to be sad, angry, frustrated, etc., due to events beyond your control. But if you get stuck there, that's on you.