Ed Witten, perhaps the greatest theoretical physicist alive, studied History until one day in college he decided he wanted to be a Physicist.Quote from stevegee58:
You can't just look in the mirror one morning and decide you want to be an engineer "because it makes sense".
Every engineer I know (including me) knew they were going to be engineers when they were like 10 years old. It's either in your blood or it's not.
Granted, this is not normal, but there are no generalities.

if you think thats true then you can make money recruiting because many firms i know of cant find anyone