et/profit of what biz corp?;LLC, S or C-corp? is separated during personl bankruptcy? chpt.7 likely?

If I begin an S or C corp. will that separate entity be free of liability to pay personal creditors? is et or profit of the company not considered mine as a shareholder? how does a personal chpt. 7 bankruptcy negatively impact, or affect a new business; shareholders, et/profit etc.? how is being a shareholder of a corp. viewed during bankruptcy? especially first year?