Thucy,
It's not like we're all cold, calculative egotistical idiots who never had a dream. I read chemistry in a very good school, because I thought it "mattered" more than what would have been intellectually much less challenging subjects such as finance, law, etc.. I don't regret having studied chemistry with that whim of idealism and dream (yay, molecules, cool, what do they do? wow, a medicine, how do I make that? etc) in my decision, but I'm also happy that I made some sensible choices after graduating that allow me a more and more comfortable lifestyle and more prospects of a job than ... say had I done a literature major.
The thing is, I believe you did live the dream to a large extent (you spent time in Africa didn't you) and now there's somebody who wakes you up and says "look, I got this really cool thing for you. It'll be different, but satisfying in a wholly different way, and you say no no no, this dreaming works fine for me, I'm gonna keep doing that for a while longer. Retirement is an outdated concept.
Yeah. I think that first doing what you did, studying something that matters, going to Africa and then getting a good job IS the dream, whereas trying to stay in that "young-feel-good" mode is the illusion. You pick yourself. I'm a few years older than Invictus I think, so you got two people who have progressed a little further, but not so much as to forget how they progressed, and we're telling you not only is it stupid, it is... I dunno... like walking into a wall just to know how it feels.