Business man and Engineers ------ Calming down, back from the conference

I never considered myself as a business people, that is why I tried very hard to switch to an engineering course, because I like engineers' down to earth, practical and realistic styles. When I talk with engineers, I like to trust their words. However, I still ended up in business schools, finally, after many years' struggle, which is the destine I have to face. The question is that do I have to get myself into the shape of a business man. Do I have to brag? Do I have to show off my money right in front of others' eyes? Do I have to pretend I like luxuries, even though it is definitely an environmental disaster? Do I have to say, always, I am a shark-killer ...... (anything more?)