I wanted to be an astronaut, still do. I also wanted to be a 'mad scientist' and inventor, or an architect and be artistic.
I am now studying environmental architecture, I invent things, make things and create very artistic furniture and I act.
As for the astronaut bit, if I was offered a one way trip in a deep space probe to do a planetary tour for the rest of my life, recording and monitoring the latest discoveries in the solar system before heading out into the Oort cloud I would take it, no questions and no regrets.