I wish I'd known that we live in the most peaceful, politically secure and financially rich time in human history. That I could have earnt enough through education and a half decent job to have pursued painting and travelled the world from a young age.
People are always going on about how bad the world is, obviously it was a big part of my upbringing too, but never before in history could an ordinary person, without huge wealth or nobility actually decide what to do with their life. I wish I'd known that.