I think I want to major in aerospace engineering..
Do it! But don't work for NASA. You better not work for NASA. Work for the military!
NO! Because I'll end up having to design machinery and weapons for war, and I don't want to do that.
So?!?!? Watch. I'll become successful. So successful, terrorists will kidnap me for my knowledge. They will kidnap me to force me to make weapons for them. But I won't want to do that. Instead, I'll build a suit of armour and escape. I will be Iron Man.