I was thinking in mechanical engineering or mechatronic engineering, i really want to build things and love physics and math. I only left 4 months to choose career, some lights please.
Are you in high school and deciding which university course to apply to or...?
If so, why is NASA mentioned? There are many companies for engineers building the sort of things you might imagine happen at NASA, not least of all defence and aeronautic companies.
You could also think about aeronautical engineering.
Ability to count backwards from 10?
Actually according to a friend at Nasa, that is contracted out !