What makes us the people we are today*
I don't believe there is anyone who can be faithful to the cliché "if I could go back, I wouldn't change anything, for everything I did made me the person I am today". If I was to go back through time, I would definitely change several things. Especially because those were the things that made us the people we are today.
*Yes, I quoted you. And translated you - badly, but I did. I'm sorry, but I couldn't help it - that piece of text was too good not to quote.