My life is certainly not perfect, but looking back there's not much that I'd change. I made mistakes but that helped me figure things out. I wasted money on some stuff, but learned from that waste.
Mostly this ^^
Generic life choices: no changes, I love where I am at.
Financially:
1- had to be a little more aggressive in 2008/9, I had small amounts of money but still only had 30-40% of my total NW invested.
Hasn't made a huge difference but I would be 1 or maybe 2 years closer to my goal had I gone all in.
Just did not have the experience at the time, plus index funds were totally unknown in Europe at the time. Had to be individual stocks, I only picked major companies but still made me more cautious.
2- could probably have saved a bit more in my first two years in the USA before I discovered MMM.
But maybe I'm just seeing my 25-30 year old self with my 36 year old eyes.
We change, our priorities change, so obviously now it seems very stupid to buy a flight to Oslo just to go watch Immortal, but at the time it felt awesome and have great memories because of that trip.
Luckily my parents (and my wife's) beat frugality into my brain since very young age (for example, I never, ever had a negative net worth in my life) so really no complaints here.