It's a difficult one because our decisions & mistakes made earlier in our lives are what make us who we are today.

It's a cliché, but mistakes are an opportunity to learn, that means I've had a hell of a lot of learning experiences!

If anything, the only things worth regretting are mistakes that you've repeated - because they could be avoidable?

I dropped out of dental school in order to pursue a computer-science degree instead. Everyone around me told me I should have done the comp-sci degree in the first place, with hind-sight that's obvious and technically I 'lost' a year. But that one year of studying for dentistry and having to make the major decision to drop-out was fantastic experience.