Should I file bankruptcy? Please any advice will help...?

I need to know if I should file bankruptcy. I have read online that IF you do not have ANY valuable assets, and limited pay, meaning NOTHING by law that a creditor can take from you that there is no need to file bankruptcy? Amount owed is all credit cards (about $15,000 maybe a little more) and also a home morgage that I would be happy to include. Is it better to just let them charge off the cards or to file bankruptcy? I have NO valuable assets at all and also get a SMALL amount of help from the state. I will answer any questions... I need TRUE advice on this PLEASE!