Bravo boy, it is precisely that.
Though I was meaning something else as I was talking about something else which is less complicated than that, my words also implie that if one could become astronaut and not you, then it means they were able to push their limits further than you, not because they were different than you, but because they made more efforts than you, both intellectual and physical, which you could do as well. Then again, I push the fact that "luck" is an important factor, but if we're smart enough we can still push our own luck. (Smartness is not something we're born with, just to say)
Biologically we're different, but that does't have to do with the mental, for all people are born with the same brain, save for when there are some pathologies. Science talks better than words anyway.