Normally business liabilities of the business don't go through to the LLC Members. However, that may not be the case if you are a personal guarantor of the debt. Check with the Business Law attorney who is forming your LLC. Good Luck!
If the credit cards were opened under your name, the LLC isn't legally responsible for paying them & bankruptcy of the LLC won't affect them. Plus, bankruptcy of the LLC won't discharge any of the LLC's debts, it will only provide for liquidation of the assets of the LLC. Frankly, most of the money in this kind of liquidation will go towards paying legal fees, so filing a bankruptcy for an LLC is usually a bad idea. Meet with a local bankruptcy attorney for advise before you shoot yourself in the foot. Hope this perspective helps!
First, don't start a business that you are concerned on filling bankruptcy. Next, your credit cards are your responsibly. Get credit cards in the llc name. Otherwise, you are a creditor to the llc. Your credit cards will not be discharged.